diff --git a/src/class_diagram/generators/mermaid/class_diagram_generator.cc b/src/class_diagram/generators/mermaid/class_diagram_generator.cc
index 8b9b21f2..6503cc37 100644
--- a/src/class_diagram/generators/mermaid/class_diagram_generator.cc
+++ b/src/class_diagram/generators/mermaid/class_diagram_generator.cc
@@ -287,8 +287,8 @@ void generator::generate(const concept_ &c, std::ostream &ostr) const
     ostr << indent(1) << "class"
          << " " << c.alias();
 
-    if (!c.style().empty())
-        ostr << " " << c.style();
+    if (!c.style())
+        ostr << " " << c.style().value();
 
     ostr << " {" << '\n';
     ostr << indent(2) << "<<concept>>\n";
diff --git a/src/class_diagram/generators/plantuml/class_diagram_generator.cc b/src/class_diagram/generators/plantuml/class_diagram_generator.cc
index 93d29bc1..c657c9a7 100644
--- a/src/class_diagram/generators/plantuml/class_diagram_generator.cc
+++ b/src/class_diagram/generators/plantuml/class_diagram_generator.cc
@@ -108,7 +108,7 @@ void generator::generate_alias(const concept_ &c, std::ostream &ostr) const
 
     if (config().generate_fully_qualified_name())
         ostr << "class"
-             << " \"" << c.name();
+             << " \"" << c.full_name_no_ns();
     else
         ostr << "class"
              << " \"" << render_name(c.full_name());
@@ -137,8 +137,7 @@ void generator::generate(const class_ &c, std::ostream &ostr) const
         common_generator<diagram_config, diagram_model>::generate_link(ostr, c);
     }
 
-    if (!c.style().empty())
-        ostr << " " << c.style();
+    generate_style(ostr, c.type_name(), c);
 
     ostr << " {" << '\n';
 
@@ -169,8 +168,7 @@ void generator::generate(const class_ &c, std::ostream &ostr) const
         catch (error::uml_alias_missing &e) {
             LOG_DBG("Skipping {} relation from {} to {} due "
                     "to: {}",
-                plantuml_common::to_plantuml(r.type(), r.style()),
-                c.full_name(), r.destination(), e.what());
+                to_string(r.type()), c.full_name(), r.destination(), e.what());
         }
     }
 
@@ -378,8 +376,7 @@ void generator::generate(const concept_ &c, std::ostream &ostr) const
         common_generator<diagram_config, diagram_model>::generate_link(ostr, c);
     }
 
-    if (!c.style().empty())
-        ostr << " " << c.style();
+    generate_style(ostr, c.type_name(), c);
 
     ostr << " {" << '\n';
 
@@ -444,8 +441,7 @@ void generator::generate_relationship(
 {
     namespace plantuml_common = clanguml::common::generators::plantuml;
 
-    LOG_DBG("Processing relationship {}",
-        plantuml_common::to_plantuml(r.type(), r.style()));
+    LOG_DBG("Processing relationship {}", to_string(r.type()));
 
     std::string destination;
 
@@ -463,7 +459,7 @@ void generator::generate_relationship(
     if (!r.multiplicity_source().empty())
         puml_relation += "\"" + r.multiplicity_source() + "\" ";
 
-    puml_relation += plantuml_common::to_plantuml(r.type(), r.style());
+    puml_relation += plantuml_common::to_plantuml(r, config());
 
     if (!r.multiplicity_destination().empty())
         puml_relation += " \"" + r.multiplicity_destination() + "\"";
@@ -491,7 +487,7 @@ void generator::generate_relationships(
             continue;
 
         LOG_DBG("== Processing relationship {}",
-            plantuml_common::to_plantuml(r.type(), r.style()));
+            plantuml_common::to_plantuml(r, config()));
 
         std::stringstream relstr;
         clanguml::common::id_t destination{0};
@@ -502,7 +498,7 @@ void generator::generate_relationships(
             if (!r.multiplicity_source().empty())
                 puml_relation += "\"" + r.multiplicity_source() + "\" ";
 
-            puml_relation += plantuml_common::to_plantuml(r.type(), r.style());
+            puml_relation += plantuml_common::to_plantuml(r, config());
 
             if (!r.multiplicity_destination().empty())
                 puml_relation += " \"" + r.multiplicity_destination() + "\"";
@@ -541,8 +537,7 @@ void generator::generate_relationships(
         catch (error::uml_alias_missing &e) {
             LOG_DBG("=== Skipping {} relation from {} to {} due "
                     "to: {}",
-                plantuml_common::to_plantuml(r.type(), r.style()),
-                c.full_name(), destination, e.what());
+                to_string(r.type()), c.full_name(), destination, e.what());
         }
     }
 
@@ -587,8 +582,7 @@ void generator::generate_relationships(
         if (!model().should_include(r.type()))
             continue;
 
-        LOG_DBG("== Processing relationship {}",
-            plantuml_common::to_plantuml(r.type(), r.style()));
+        LOG_DBG("== Processing relationship {}", to_string(r.type()));
 
         std::stringstream relstr;
         clanguml::common::id_t destination{0};
@@ -599,7 +593,7 @@ void generator::generate_relationships(
             if (!r.multiplicity_source().empty())
                 puml_relation += "\"" + r.multiplicity_source() + "\" ";
 
-            puml_relation += plantuml_common::to_plantuml(r.type(), r.style());
+            puml_relation += plantuml_common::to_plantuml(r, config());
 
             if (!r.multiplicity_destination().empty())
                 puml_relation += " \"" + r.multiplicity_destination() + "\"";
@@ -638,8 +632,7 @@ void generator::generate_relationships(
         catch (error::uml_alias_missing &e) {
             LOG_DBG("=== Skipping {} relation from {} to {} due "
                     "to: {}",
-                plantuml_common::to_plantuml(r.type(), r.style()),
-                c.full_name(), destination, e.what());
+                to_string(r.type()), c.full_name(), destination, e.what());
         }
     }
 
@@ -654,8 +647,7 @@ void generator::generate(const enum_ &e, std::ostream &ostr) const
         common_generator<diagram_config, diagram_model>::generate_link(ostr, e);
     }
 
-    if (!e.style().empty())
-        ostr << " " << e.style();
+    generate_style(ostr, e.type_name(), e);
 
     ostr << " {" << '\n';
 
@@ -687,7 +679,7 @@ void generator::generate_relationships(const enum_ &e, std::ostream &ostr) const
 
             relstr << e.alias() << " "
                    << clanguml::common::generators::plantuml::to_plantuml(
-                          r.type(), r.style())
+                          r, config())
                    << " " << target_alias;
 
             if (!r.label().empty())
@@ -701,7 +693,7 @@ void generator::generate_relationships(const enum_ &e, std::ostream &ostr) const
             LOG_DBG("Skipping {} relation from {} to {} due "
                     "to: {}",
                 clanguml::common::generators::plantuml::to_plantuml(
-                    r.type(), r.style()),
+                    r, config()),
                 e.full_name(), destination, ex.what());
         }
     }
@@ -724,8 +716,7 @@ void generator::generate(const package &p, std::ostream &ostr) const
             if (p.is_deprecated())
                 ostr << " <<deprecated>>";
 
-            if (!p.style().empty())
-                ostr << " " << p.style();
+            generate_style(ostr, p.type_name(), p);
 
             ostr << " {" << '\n';
         }
diff --git a/src/class_diagram/visitor/translation_unit_visitor.cc b/src/class_diagram/visitor/translation_unit_visitor.cc
index 704abacf..23900ac8 100644
--- a/src/class_diagram/visitor/translation_unit_visitor.cc
+++ b/src/class_diagram/visitor/translation_unit_visitor.cc
@@ -462,12 +462,12 @@ void translation_unit_visitor::process_constraint_requirements(
                 parm_var_decl) {
                 parm_var_decl->getQualifiedNameAsString();
 
-                auto param_name = parm_var_decl->getQualifiedNameAsString();
+                auto param_name = parm_var_decl->getNameAsString();
                 auto param_type = common::to_string(
                     parm_var_decl->getType(), cpt->getASTContext());
 
                 LOG_DBG("=== Processing parameter variable declaration: {}, {}",
-                    param_name, param_type);
+                    param_type, param_name);
 
                 concept_model.add_parameter(
                     {std::move(param_type), std::move(param_name)});
diff --git a/src/common/generators/mermaid/generator.cc b/src/common/generators/mermaid/generator.cc
index d9b3a9c0..d9d1f749 100644
--- a/src/common/generators/mermaid/generator.cc
+++ b/src/common/generators/mermaid/generator.cc
@@ -19,7 +19,8 @@
 
 namespace clanguml::common::generators::mermaid {
 
-std::string to_mermaid(relationship_t r, const std::string & /*style*/)
+std::string to_mermaid(
+    relationship_t r, const std::optional<std::string> & /*style*/)
 {
     switch (r) {
     case relationship_t::kOwnership:
diff --git a/src/common/generators/mermaid/generator.h b/src/common/generators/mermaid/generator.h
index 93bedffc..a537bfd2 100644
--- a/src/common/generators/mermaid/generator.h
+++ b/src/common/generators/mermaid/generator.h
@@ -38,7 +38,8 @@ using clanguml::common::model::element;
 using clanguml::common::model::message_t;
 using clanguml::common::model::relationship_t;
 
-std::string to_mermaid(relationship_t r, const std::string &style);
+std::string to_mermaid(
+    relationship_t r, const std::optional<std::string> &style);
 std::string to_mermaid(access_t scope);
 std::string to_mermaid(message_t r);
 
diff --git a/src/common/generators/plantuml/generator.cc b/src/common/generators/plantuml/generator.cc
index c05932d9..9b17a86e 100644
--- a/src/common/generators/plantuml/generator.cc
+++ b/src/common/generators/plantuml/generator.cc
@@ -19,28 +19,48 @@
 
 namespace clanguml::common::generators::plantuml {
 
-std::string to_plantuml(relationship_t r, const std::string &style)
+std::string to_plantuml(const relationship &r, const config::diagram &cfg)
 {
-    switch (r) {
+    using common::model::relationship_t;
+
+    std::string style;
+
+    const auto &inline_style = r.style();
+
+    if (inline_style && !inline_style.value().empty()) {
+        if (inline_style && inline_style.value().back() == ']')
+            style = *inline_style;
+        else
+            style = fmt::format("[{}]", inline_style.value());
+    }
+
+    if (style.empty() && cfg.puml) {
+        if (auto config_style = cfg.puml().get_style(r.type());
+            config_style.has_value()) {
+            style = config_style.value();
+        }
+    }
+
+    switch (r.type()) {
     case relationship_t::kOwnership:
     case relationship_t::kComposition:
-        return style.empty() ? "*--" : fmt::format("*-[{}]-", style);
+        return style.empty() ? "*--" : fmt::format("*-{}-", style);
     case relationship_t::kAggregation:
-        return style.empty() ? "o--" : fmt::format("o-[{}]-", style);
+        return style.empty() ? "o--" : fmt::format("o-{}-", style);
     case relationship_t::kContainment:
-        return style.empty() ? "--+" : fmt::format("-[{}]-+", style);
+        return style.empty() ? "--+" : fmt::format("-{}-+", style);
     case relationship_t::kAssociation:
-        return style.empty() ? "-->" : fmt::format("-[{}]->", style);
+        return style.empty() ? "-->" : fmt::format("-{}->", style);
     case relationship_t::kInstantiation:
-        return style.empty() ? "..|>" : fmt::format(".[{}].|>", style);
+        return style.empty() ? "..|>" : fmt::format(".{}.|>", style);
     case relationship_t::kFriendship:
-        return style.empty() ? "<.." : fmt::format("<.[{}].", style);
+        return style.empty() ? "<.." : fmt::format("<.{}.", style);
     case relationship_t::kDependency:
-        return style.empty() ? "..>" : fmt::format(".[{}].>", style);
+        return style.empty() ? "..>" : fmt::format(".{}.>", style);
     case relationship_t::kConstraint:
-        return style.empty() ? "..>" : fmt::format(".[{}].>", style);
+        return style.empty() ? "..>" : fmt::format(".{}.>", style);
     case relationship_t::kAlias:
-        return style.empty() ? ".." : fmt::format(".[{}].", style);
+        return style.empty() ? ".." : fmt::format(".{}.", style);
     default:
         return "";
     }
diff --git a/src/common/generators/plantuml/generator.h b/src/common/generators/plantuml/generator.h
index 4a2446ee..6611336b 100644
--- a/src/common/generators/plantuml/generator.h
+++ b/src/common/generators/plantuml/generator.h
@@ -19,6 +19,7 @@
 
 #include "common/generators/generator.h"
 #include "common/model/diagram_filter.h"
+#include "common/model/relationship.h"
 #include "config/config.h"
 #include "util/error.h"
 #include "util/util.h"
@@ -36,9 +37,9 @@ namespace clanguml::common::generators::plantuml {
 using clanguml::common::model::access_t;
 using clanguml::common::model::element;
 using clanguml::common::model::message_t;
-using clanguml::common::model::relationship_t;
+using clanguml::common::model::relationship;
 
-std::string to_plantuml(relationship_t r, const std::string &style);
+std::string to_plantuml(const relationship &r, const config::diagram &cfg);
 std::string to_plantuml(access_t scope);
 std::string to_plantuml(message_t r);
 
@@ -124,6 +125,19 @@ public:
     void generate_notes(
         std::ostream &ostr, const model::element &element) const;
 
+    /**
+     * @brief Generate diagram element PlantUML style
+     *
+     * This method renders a style for a specific `el` element if specified
+     * in the config file or inline comment directive.
+     *
+     * @param ostr Output stream
+     * @param element_type Name of the element type (e.g. "class")
+     * @param el Reference to a stylable diagram element
+     */
+    void generate_style(std::ostream &ostr, const std::string &element_type,
+        const model::stylable_element &el) const;
+
     /**
      * @brief Generate comment with diagram metadata
      *
@@ -437,6 +451,22 @@ void generator<C, D>::generate_plantuml_directives(
     }
 }
 
+template <typename C, typename D>
+void generator<C, D>::generate_style(std::ostream &ostr,
+    const std::string &element_type, const model::stylable_element &el) const
+{
+    const auto &config = generators::generator<C, D>::config();
+
+    if (el.style() && !el.style().value().empty())
+        ostr << " " << *el.style();
+    else if (config.puml) {
+        if (const auto config_style = config.puml().get_style(element_type);
+            config_style) {
+            ostr << " " << *config_style;
+        }
+    }
+}
+
 template <typename C, typename D>
 void generator<C, D>::generate_notes(
     std::ostream &ostr, const model::element &e) const
diff --git a/src/common/model/diagram_element.h b/src/common/model/diagram_element.h
index 8aa6264a..224181af 100644
--- a/src/common/model/diagram_element.h
+++ b/src/common/model/diagram_element.h
@@ -93,16 +93,16 @@ public:
     void set_name(const std::string &name) { name_ = name; }
 
     /**
-     * Return diagram's name.
+     * Return diagram element name.
      *
-     * @return Diagram's name.
+     * @return Diagram element name.
      */
     std::string name() const { return name_; }
 
     /**
-     * Return the type name of the diagram.
+     * Return the type name of the diagram element.
      *
-     * @return Diagrams type name.
+     * @return Diagrams element type name.
      */
     virtual std::string type_name() const { return "__undefined__"; };
 
diff --git a/src/common/model/stylable_element.cc b/src/common/model/stylable_element.cc
index ea61d0ba..75517627 100644
--- a/src/common/model/stylable_element.cc
+++ b/src/common/model/stylable_element.cc
@@ -22,6 +22,6 @@ namespace clanguml::common::model {
 
 void stylable_element::set_style(const std::string &style) { style_ = style; }
 
-std::string stylable_element::style() const { return style_; }
+std::optional<std::string> stylable_element::style() const { return style_; }
 
 }
diff --git a/src/common/model/stylable_element.h b/src/common/model/stylable_element.h
index 201da800..04399ea5 100644
--- a/src/common/model/stylable_element.h
+++ b/src/common/model/stylable_element.h
@@ -17,6 +17,7 @@
  */
 #pragma once
 
+#include <optional>
 #include <string>
 
 namespace clanguml::common::model {
@@ -40,10 +41,10 @@ public:
      *
      * @return Style specification
      */
-    std::string style() const;
+    std::optional<std::string> style() const;
 
 private:
-    std::string style_;
+    std::optional<std::string> style_;
 };
 
 } // namespace clanguml::common::model
diff --git a/src/config/config.cc b/src/config/config.cc
index a12e10af..0a59d7d8 100644
--- a/src/config/config.cc
+++ b/src/config/config.cc
@@ -168,6 +168,24 @@ std::string to_string(member_order_t mo)
     }
 }
 
+std::optional<std::string> plantuml::get_style(
+    const common::model::relationship_t relationship_type) const
+{
+    if (style.count(to_string(relationship_type)) == 0)
+        return {};
+
+    return style.at(to_string(relationship_type));
+}
+
+std::optional<std::string> plantuml::get_style(
+    const std::string &element_type) const
+{
+    if (style.count(element_type) == 0)
+        return {};
+
+    return style.at(element_type);
+}
+
 void plantuml::append(const plantuml &r)
 {
     before.insert(before.end(), r.before.begin(), r.before.end());
diff --git a/src/config/config.h b/src/config/config.h
index 22c5ad65..dcdd58bd 100644
--- a/src/config/config.h
+++ b/src/config/config.h
@@ -109,6 +109,11 @@ enum class comment_parser_t {
 
 std::string to_string(comment_parser_t cp);
 
+struct plantuml_keyword_mapping_t {
+    std::map<common::model::relationship_t, std::pair<std::string, std::string>>
+        relationships;
+};
+
 /**
  * @brief PlantUML diagram config section
  *
@@ -123,6 +128,13 @@ struct plantuml {
     std::vector<std::string> after;
     /*! Command template to render diagram using PlantUML */
     std::string cmd;
+    /*! Provide customized styles for various elements */
+    std::map<std::string, std::string> style;
+
+    std::optional<std::string> get_style(
+        const common::model::relationship_t relationship_type) const;
+
+    std::optional<std::string> get_style(const std::string &element_type) const;
 
     void append(const plantuml &r);
 };
diff --git a/src/config/schema.h b/src/config/schema.h
index 1569a9ea..fa76104c 100644
--- a/src/config/schema.h
+++ b/src/config/schema.h
@@ -160,6 +160,7 @@ types:
             before: !optional [string]
             after: !optional [string]
             cmd: !optional string
+            style: !optional map_t<string;string>
         mermaid: !optional
             before: !optional [string]
             after: !optional [string]
diff --git a/src/config/yaml_decoders.cc b/src/config/yaml_decoders.cc
index 3faf4347..bcf5f329 100644
--- a/src/config/yaml_decoders.cc
+++ b/src/config/yaml_decoders.cc
@@ -411,6 +411,9 @@ template <> struct convert<plantuml> {
         if (node["cmd"])
             rhs.cmd = node["cmd"].as<decltype(rhs.cmd)>();
 
+        if (node["style"])
+            rhs.style = node["style"].as<decltype(rhs.style)>();
+
         return true;
     }
 };
diff --git a/src/include_diagram/generators/plantuml/include_diagram_generator.cc b/src/include_diagram/generators/plantuml/include_diagram_generator.cc
index 9dd04e71..373607e8 100644
--- a/src/include_diagram/generators/plantuml/include_diagram_generator.cc
+++ b/src/include_diagram/generators/plantuml/include_diagram_generator.cc
@@ -53,7 +53,7 @@ void generator::generate_relationships(
             },
             [&f, &ostr, this](const auto &r) {
                 ostr << f.alias() << " "
-                     << plantuml_common::to_plantuml(r.type(), r.style()) << " "
+                     << plantuml_common::to_plantuml(r, config()) << " "
                      << model().get(r.destination()).value().alias() << '\n';
             });
     }
diff --git a/src/package_diagram/generators/plantuml/package_diagram_generator.cc b/src/package_diagram/generators/plantuml/package_diagram_generator.cc
index a7e90722..998afb3f 100644
--- a/src/package_diagram/generators/plantuml/package_diagram_generator.cc
+++ b/src/package_diagram/generators/plantuml/package_diagram_generator.cc
@@ -89,8 +89,8 @@ void generator::generate(const package &p, std::ostream &ostr) const
             generate_link(ostr, p);
         }
 
-        if (!p.style().empty())
-            ostr << " " << p.style();
+        if (p.style())
+            ostr << " " << p.style().value();
 
         ostr << " {" << '\n';
     }
diff --git a/tests/t00009/.clang-uml b/tests/t00009/.clang-uml
index 34653ebf..bb42e691 100644
--- a/tests/t00009/.clang-uml
+++ b/tests/t00009/.clang-uml
@@ -4,6 +4,11 @@ diagrams:
     glob:
       - t00009.cc
     using_namespace: clanguml::t00009
+    plantuml:
+      style:
+        instantiation: up
+        association: up
+        aggregation: up
     include:
       namespaces:
         - clanguml::t00009
diff --git a/tests/t00009/test_case.h b/tests/t00009/test_case.h
index c72a3a00..77885a25 100644
--- a/tests/t00009/test_case.h
+++ b/tests/t00009/test_case.h
@@ -43,15 +43,18 @@ TEST_CASE("t00009", "[test-case][class]")
         REQUIRE_THAT(
             src, (IsField<Public>("avector", "A<std::vector<std::string>> &")));
 
-        REQUIRE_THAT(src, IsInstantiation(_A("A<T>"), _A("A<int>")));
-        REQUIRE_THAT(src, IsInstantiation(_A("A<T>"), _A("A<std::string>")));
-
-        REQUIRE_THAT(src, IsAggregation(_A("B"), _A("A<int>"), "+aint"));
+        REQUIRE_THAT(src, IsInstantiation(_A("A<T>"), _A("A<int>"), "up"));
         REQUIRE_THAT(
-            src, IsAssociation(_A("B"), _A("A<std::string>"), "+astring"));
+            src, IsInstantiation(_A("A<T>"), _A("A<std::string>"), "up"));
+
+        REQUIRE_THAT(
+            src, IsAggregation(_A("B"), _A("A<int>"), "+aint", "", "", "up"));
         REQUIRE_THAT(src,
             IsAssociation(
-                _A("B"), _A("A<std::vector<std::string>>"), "+avector"));
+                _A("B"), _A("A<std::string>"), "+astring", "", "", "up"));
+        REQUIRE_THAT(src,
+            IsAssociation(_A("B"), _A("A<std::vector<std::string>>"),
+                "+avector", "", "", "up"));
 
         save_puml(config.output_directory(), diagram->name + ".puml", src);
     }
diff --git a/tests/t00016/.clang-uml b/tests/t00016/.clang-uml
index 7b0d1b58..eb9b3051 100644
--- a/tests/t00016/.clang-uml
+++ b/tests/t00016/.clang-uml
@@ -4,6 +4,9 @@ diagrams:
     glob:
       - t00016.cc
     using_namespace: clanguml::t00016
+    plantuml:
+      style:
+        instantiation: up
     include:
       namespaces:
         - clanguml::t00016
diff --git a/tests/t00016/test_case.h b/tests/t00016/test_case.h
index 52b6bc3f..5efdbe20 100644
--- a/tests/t00016/test_case.h
+++ b/tests/t00016/test_case.h
@@ -41,16 +41,17 @@ TEST_CASE("t00016", "[test-case][class]")
         REQUIRE_THAT(src, IsClassTemplate("is_numeric", "float"));
 
         REQUIRE_THAT(src,
-            IsInstantiation(_A("is_numeric<typename>"), _A("is_numeric<int>")));
+            IsInstantiation(
+                _A("is_numeric<typename>"), _A("is_numeric<int>"), "up"));
         REQUIRE_THAT(src,
             IsInstantiation(
-                _A("is_numeric<typename>"), _A("is_numeric<bool>")));
+                _A("is_numeric<typename>"), _A("is_numeric<bool>"), "up"));
         REQUIRE_THAT(src,
             IsInstantiation(
-                _A("is_numeric<typename>"), _A("is_numeric<char>")));
+                _A("is_numeric<typename>"), _A("is_numeric<char>"), "up"));
         REQUIRE_THAT(src,
             IsInstantiation(
-                _A("is_numeric<typename>"), _A("is_numeric<float>")));
+                _A("is_numeric<typename>"), _A("is_numeric<float>"), "up"));
 
         save_puml(config.output_directory(), diagram->name + ".puml", src);
     }
diff --git a/tests/t00019/.clang-uml b/tests/t00019/.clang-uml
index 8cda1d78..6887aca0 100644
--- a/tests/t00019/.clang-uml
+++ b/tests/t00019/.clang-uml
@@ -5,6 +5,9 @@ diagrams:
       - "*.cc"
     generate_template_argument_dependencies: false
     using_namespace: clanguml::t00019
+    plantuml:
+      style:
+        instantiation: up
     include:
       namespaces:
         - clanguml::t00019
diff --git a/tests/t00031/test_case.h b/tests/t00031/test_case.h
index eb9d8c50..d4ab8482 100644
--- a/tests/t00031/test_case.h
+++ b/tests/t00031/test_case.h
@@ -41,18 +41,18 @@ TEST_CASE("t00031", "[test-case][class]")
         REQUIRE_THAT(src, IsClass(_A("D")));
 
         REQUIRE_THAT(src,
-            IsAssociationWithStyle(
-                _A("R"), _A("A"), "+aaa", "#red,dashed,thickness=2"));
+            IsAssociation(
+                _A("R"), _A("A"), "+aaa", "", "", "[#red,dashed,thickness=2]"));
         REQUIRE_THAT(src,
-            IsCompositionWithStyle(
-                _A("R"), _A("B"), "+bbb", "#green,dashed,thickness=4"));
+            IsComposition(_A("R"), _A("B"), "+bbb", "", "",
+                "[#green,dashed,thickness=4]"));
         REQUIRE_THAT(src, IsDependency(_A("R"), _A("B")));
         REQUIRE_THAT(src,
-            IsAggregationWithStyle(
-                _A("R"), _A("C<int>"), "+ccc", "#blue,dotted,thickness=8"));
+            IsAggregation(_A("R"), _A("C<int>"), "+ccc", "", "",
+                "[#blue,dotted,thickness=8]"));
         REQUIRE_THAT(src,
-            IsAssociationWithStyle(
-                _A("R"), _A("D"), "+ddd", "#blue,plain,thickness=16"));
+            IsAssociation(_A("R"), _A("D"), "+ddd", "", "",
+                "[#blue,plain,thickness=16]"));
 
         save_puml(config.output_directory(), diagram->name + ".puml", src);
     }
diff --git a/tests/t00033/.clang-uml b/tests/t00033/.clang-uml
index 27279195..5255fa07 100644
--- a/tests/t00033/.clang-uml
+++ b/tests/t00033/.clang-uml
@@ -4,6 +4,9 @@ diagrams:
     glob:
       - t00033.cc
     using_namespace: clanguml::t00033
+    plantuml:
+      style:
+        instantiation: up
     include:
       namespaces:
         - clanguml::t00033
diff --git a/tests/t00033/test_case.h b/tests/t00033/test_case.h
index 4e9a9c61..d5fdd3e7 100644
--- a/tests/t00033/test_case.h
+++ b/tests/t00033/test_case.h
@@ -48,11 +48,12 @@ TEST_CASE("t00033", "[test-case][class]")
             src, IsDependency(_A("B<std::unique_ptr<C<D>>>"), _A("C<D>")));
         REQUIRE_THAT(src, IsDependency(_A("C<D>"), _A("D")));
 
-        REQUIRE_THAT(src, IsInstantiation(_A("C<T>"), _A("C<D>")));
-        REQUIRE_THAT(
-            src, IsInstantiation(_A("B<T>"), _A("B<std::unique_ptr<C<D>>>")));
+        REQUIRE_THAT(src, IsInstantiation(_A("C<T>"), _A("C<D>"), "up"));
         REQUIRE_THAT(src,
-            IsInstantiation(_A("A<T>"), _A("A<B<std::unique_ptr<C<D>>>>")));
+            IsInstantiation(_A("B<T>"), _A("B<std::unique_ptr<C<D>>>"), "up"));
+        REQUIRE_THAT(src,
+            IsInstantiation(
+                _A("A<T>"), _A("A<B<std::unique_ptr<C<D>>>>"), "up"));
 
         save_puml(config.output_directory(), diagram->name + ".puml", src);
     }
diff --git a/tests/t00042/.clang-uml b/tests/t00042/.clang-uml
index 8b0ee5f2..442348fe 100644
--- a/tests/t00042/.clang-uml
+++ b/tests/t00042/.clang-uml
@@ -5,6 +5,9 @@ diagrams:
     glob:
       - t00042.cc
     using_namespace: clanguml::t00042
+    plantuml:
+      style:
+        instantiation: up
     include:
       specializations:
         - clanguml::t00042::A<T>
diff --git a/tests/t00047/.clang-uml b/tests/t00047/.clang-uml
index 3dc96754..df387a8a 100644
--- a/tests/t00047/.clang-uml
+++ b/tests/t00047/.clang-uml
@@ -4,6 +4,9 @@ diagrams:
     glob:
       - t00047.cc
     using_namespace: clanguml::t00047
+    plantuml:
+      style:
+        instantiation: up
     include:
       namespaces:
         - clanguml::t00047
\ No newline at end of file
diff --git a/tests/t00059/.clang-uml b/tests/t00059/.clang-uml
index 1d394b92..0c53bbc1 100644
--- a/tests/t00059/.clang-uml
+++ b/tests/t00059/.clang-uml
@@ -6,4 +6,11 @@ diagrams:
     include:
       namespaces:
         - clanguml::t00059
+    plantuml:
+      style:
+        instantiation: up
+        association: up
+        aggregation: up
+        dependency: up
+        constraint: up
     using_namespace: clanguml::t00059
\ No newline at end of file
diff --git a/tests/t00059/test_case.h b/tests/t00059/test_case.h
index 3f72389b..851b1e87 100644
--- a/tests/t00059/test_case.h
+++ b/tests/t00059/test_case.h
@@ -40,9 +40,9 @@ TEST_CASE("t00059", "[test-case][class]")
         REQUIRE_THAT(src, IsConcept(_A("orange_c<T>")));
 
         REQUIRE_THAT(
-            src, IsConstraint(_A("apple_c<T>"), _A("fruit_c<T>"), "T"));
+            src, IsConstraint(_A("apple_c<T>"), _A("fruit_c<T>"), "T", "up"));
         REQUIRE_THAT(
-            src, IsConstraint(_A("orange_c<T>"), _A("fruit_c<T>"), "T"));
+            src, IsConstraint(_A("orange_c<T>"), _A("fruit_c<T>"), "T", "up"));
 
         REQUIRE_THAT(
             src, IsConceptRequirement(_A("apple_c<T>"), "t.get_sweetness()"));
@@ -60,31 +60,33 @@ TEST_CASE("t00059", "[test-case][class]")
 
         REQUIRE_THAT(src,
             IsDependency(_A("fruit_factory<gala_apple,valencia_orange>"),
-                _A("gala_apple")));
+                _A("gala_apple"), "up"));
         REQUIRE_THAT(src,
             IsDependency(_A("fruit_factory<gala_apple,valencia_orange>"),
-                _A("valencia_orange")));
+                _A("valencia_orange"), "up"));
 
         REQUIRE_THAT(src,
             IsDependency(_A("fruit_factory<empire_apple,lima_orange>"),
-                _A("empire_apple")));
+                _A("empire_apple"), "up"));
         REQUIRE_THAT(src,
             IsDependency(_A("fruit_factory<empire_apple,lima_orange>"),
-                _A("lima_orange")));
+                _A("lima_orange"), "up"));
 
         REQUIRE_THAT(src,
             IsAggregation(_A("R"),
-                _A("fruit_factory<gala_apple,valencia_orange>"), "+factory_1"));
+                _A("fruit_factory<gala_apple,valencia_orange>"), "+factory_1",
+                "", "", "up"));
         REQUIRE_THAT(src,
             IsAggregation(_A("R"),
-                _A("fruit_factory<empire_apple,lima_orange>"), "+factory_2"));
+                _A("fruit_factory<empire_apple,lima_orange>"), "+factory_2", "",
+                "", "up"));
 
         REQUIRE_THAT(src,
             IsInstantiation(_A("fruit_factory<apple_c TA,orange_c TO>"),
-                _A("fruit_factory<gala_apple,valencia_orange>")));
+                _A("fruit_factory<gala_apple,valencia_orange>"), "up"));
         REQUIRE_THAT(src,
             IsInstantiation(_A("fruit_factory<apple_c TA,orange_c TO>"),
-                _A("fruit_factory<empire_apple,lima_orange>")));
+                _A("fruit_factory<empire_apple,lima_orange>"), "up"));
 
         save_puml(config.output_directory(), diagram->name + ".puml", src);
     }
diff --git a/tests/t00075/.clang-uml b/tests/t00075/.clang-uml
new file mode 100644
index 00000000..cfd758ba
--- /dev/null
+++ b/tests/t00075/.clang-uml
@@ -0,0 +1,17 @@
+diagrams:
+  t00075_class:
+    type: class
+    glob:
+      - t00075.cc
+    include:
+      namespaces:
+        - clanguml::t00075
+    generate_packages: true
+    using_namespace: clanguml::t00075
+    plantuml:
+      style:
+        concept: "#line:green;back:lightblue"
+        class: "#aliceblue;line:blue;line.dotted;text:blue"
+        package: "#back:grey"
+        enum: "#line.dotted"
+        constraint: "up[#green,dashed,thickness=2]"
diff --git a/tests/t00075/t00075.cc b/tests/t00075/t00075.cc
new file mode 100644
index 00000000..35bdc823
--- /dev/null
+++ b/tests/t00075/t00075.cc
@@ -0,0 +1,34 @@
+namespace clanguml {
+namespace t00075 {
+namespace ns1 {
+namespace ns2 {
+
+template <typename T>
+concept C = requires(T t) {
+                T{};
+                t.e();
+            };
+
+enum class E { k1, k2 };
+
+struct A {
+    E e() const { return E::k1; };
+};
+
+class B {
+public:
+    E e() const { return E::k2; };
+};
+
+template <C T> class ABE {
+    T a_or_b;
+};
+
+struct R {
+    ABE<A> a;
+    ABE<B> b;
+};
+} // namespace ns2
+} // namespace ns1
+}
+}
\ No newline at end of file
diff --git a/tests/t00075/test_case.h b/tests/t00075/test_case.h
new file mode 100644
index 00000000..e1f4ac19
--- /dev/null
+++ b/tests/t00075/test_case.h
@@ -0,0 +1,92 @@
+/**
+ * tests/t00075/test_case.h
+ *
+ * Copyright (c) 2021-2024 Bartek Kryza <bkryza@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+TEST_CASE("t00075", "[test-case][class]")
+{
+    auto [config, db] = load_config("t00075");
+
+    auto diagram = config.diagrams["t00075_class"];
+
+    REQUIRE(diagram->name == "t00075_class");
+
+    auto model = generate_class_diagram(*db, diagram);
+
+    REQUIRE(model->name() == "t00075_class");
+
+    {
+        auto src = generate_class_puml(diagram, *model);
+        AliasMatcher _A(src);
+
+        REQUIRE_THAT(src, StartsWith("@startuml"));
+        REQUIRE_THAT(src, EndsWith("@enduml\n"));
+
+        // Check if all classes exist
+        REQUIRE_THAT(src, IsClass(_A("A")));
+        REQUIRE_THAT(src, IsClass(_A("B")));
+        REQUIRE_THAT(src, IsClass(_A("ABE<ns1::ns2::C T>")));
+        REQUIRE_THAT(src, IsClass(_A("R")));
+
+        REQUIRE_THAT(src, IsEnum(_A("E")));
+
+        REQUIRE_THAT(src, IsConcept(_A("C<T>")));
+
+        REQUIRE_THAT(src, IsConceptRequirement(_A("C<T>"), "T{}"));
+        REQUIRE_THAT(src, IsConceptRequirement(_A("C<T>"), "t.e()"));
+        REQUIRE_THAT(src, IsConceptRequirement(_A("C<T>"), "(T t)"));
+        REQUIRE_THAT(src, !IsConceptRequirement(_A("C<T>"), "(T ns1::ns2::t)"));
+
+        REQUIRE_THAT(src,
+            IsConstraint(_A("ABE<ns1::ns2::C T>"), _A("C<T>"), "T",
+                "up[#green,dashed,thickness=2]"));
+
+        save_puml(config.output_directory(), diagram->name + ".puml", src);
+    }
+
+    {
+        auto j = generate_class_json(diagram, *model);
+
+        using namespace json;
+
+        save_json(config.output_directory(), diagram->name + ".json", j);
+    }
+
+    {
+        auto src = generate_class_mermaid(diagram, *model);
+
+        mermaid::AliasMatcher _A(src);
+        using mermaid::IsClass;
+        using mermaid::IsConcept;
+        using mermaid::IsConceptRequirement;
+        using mermaid::IsEnum;
+
+        // Check if all classes exist
+        REQUIRE_THAT(src, IsClass(_A("ns1::ns2::A")));
+        REQUIRE_THAT(src, IsClass(_A("ns1::ns2::B")));
+        REQUIRE_THAT(src, IsClass(_A("ns1::ns2::ABE<ns1::ns2::C T>")));
+        REQUIRE_THAT(src, IsClass(_A("ns1::ns2::R")));
+
+        REQUIRE_THAT(src, IsEnum(_A("ns1::ns2::E")));
+
+        REQUIRE_THAT(src, IsConcept(_A("ns1::ns2::C<T>")));
+
+        REQUIRE_THAT(src, IsConceptRequirement(_A("ns1::ns2::C<T>"), "T{}"));
+        REQUIRE_THAT(src, IsConceptRequirement(_A("ns1::ns2::C<T>"), "t.e()"));
+
+        save_mermaid(config.output_directory(), diagram->name + ".mmd", src);
+    }
+}
\ No newline at end of file
diff --git a/tests/test_cases.cc b/tests/test_cases.cc
index 22bc5097..7f5f51b7 100644
--- a/tests/test_cases.cc
+++ b/tests/test_cases.cc
@@ -417,6 +417,7 @@ using namespace clanguml::test::matchers;
 #include "t00073/test_case.h"
 #if defined(ENABLE_CXX_STD_20_TEST_CASES)
 #include "t00074/test_case.h"
+#include "t00075/test_case.h"
 #endif
 
 ///
diff --git a/tests/test_cases.h b/tests/test_cases.h
index 26883024..4b16e59c 100644
--- a/tests/test_cases.h
+++ b/tests/test_cases.h
@@ -640,14 +640,14 @@ ContainsMatcher IsInnerClass(std::string const &parent,
 
 ContainsMatcher IsAssociation(std::string const &from, std::string const &to,
     std::string const &label = "", std::string multiplicity_source = "",
-    std::string multiplicity_dest = "",
+    std::string multiplicity_dest = "", std::string style = "",
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
 {
     std::string format_string = "{}";
     if (!multiplicity_source.empty())
         format_string += " \"" + multiplicity_source + "\"";
 
-    format_string += " -->";
+    format_string += fmt::format(" -{}->", style);
 
     if (!multiplicity_dest.empty())
         format_string += " \"" + multiplicity_dest + "\"";
@@ -668,14 +668,14 @@ ContainsMatcher IsAssociation(std::string const &from, std::string const &to,
 
 ContainsMatcher IsComposition(std::string const &from, std::string const &to,
     std::string const &label, std::string multiplicity_source = "",
-    std::string multiplicity_dest = "",
+    std::string multiplicity_dest = "", std::string style = "",
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
 {
     std::string format_string = "{}";
     if (!multiplicity_source.empty())
         format_string += " \"" + multiplicity_source + "\"";
 
-    format_string += " *--";
+    format_string += fmt::format(" *-{}-", style);
 
     if (!multiplicity_dest.empty())
         format_string += " \"" + multiplicity_dest + "\"";
@@ -689,14 +689,14 @@ ContainsMatcher IsComposition(std::string const &from, std::string const &to,
 
 ContainsMatcher IsAggregation(std::string const &from, std::string const &to,
     std::string const &label, std::string multiplicity_source = "",
-    std::string multiplicity_dest = "",
+    std::string multiplicity_dest = "", std::string style = "",
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
 {
     std::string format_string = "{}";
     if (!multiplicity_source.empty())
         format_string += " \"" + multiplicity_source + "\"";
 
-    format_string += " o--";
+    format_string += fmt::format(" o-{}-", style);
 
     if (!multiplicity_dest.empty())
         format_string += " \"" + multiplicity_dest + "\"";
@@ -708,45 +708,20 @@ ContainsMatcher IsAggregation(std::string const &from, std::string const &to,
             caseSensitivity));
 }
 
-ContainsMatcher IsAggregationWithStyle(std::string const &from,
-    std::string const &to, std::string const &label, std::string style,
-    CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
-{
-    return ContainsMatcher(
-        CasedString(fmt::format("{} o-[{}]- {} : {}", from, style, to, label),
-            caseSensitivity));
-}
-
-ContainsMatcher IsAssociationWithStyle(std::string const &from,
-    std::string const &to, std::string const &label, std::string style,
-    CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
-{
-    return ContainsMatcher(
-        CasedString(fmt::format("{} -[{}]-> {} : {}", from, style, to, label),
-            caseSensitivity));
-}
-
-ContainsMatcher IsCompositionWithStyle(std::string const &from,
-    std::string const &to, std::string const &label, std::string style,
-    CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
-{
-    return ContainsMatcher(
-        CasedString(fmt::format("{} *-[{}]- {} : {}", from, style, to, label),
-            caseSensitivity));
-}
-
 ContainsMatcher IsInstantiation(std::string const &from, std::string const &to,
+    std::string style = "",
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
 {
-    return ContainsMatcher(
-        CasedString(fmt::format("{} ..|> {}", to, from), caseSensitivity));
+    return ContainsMatcher(CasedString(
+        fmt::format("{} .{}.|> {}", to, style, from), caseSensitivity));
 }
 
 ContainsMatcher IsDependency(std::string const &from, std::string const &to,
+    std::string style = "",
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
 {
-    return ContainsMatcher(
-        CasedString(fmt::format("{} ..> {}", from, to), caseSensitivity));
+    return ContainsMatcher(CasedString(
+        fmt::format("{} .{}.> {}", from, style, to), caseSensitivity));
 }
 
 namespace mermaid {
@@ -767,15 +742,16 @@ ContainsMatcher IsIncludeDependency(std::string const &from,
 }
 
 ContainsMatcher IsConstraint(std::string const &from, std::string const &to,
-    std::string const &label = {},
+    std::string const &label = {}, std::string style = "",
     CaseSensitive::Choice caseSensitivity = CaseSensitive::Yes)
 {
     if (label.empty())
-        return ContainsMatcher(
-            CasedString(fmt::format("{} ..> {}", from, to), caseSensitivity));
-    else
         return ContainsMatcher(CasedString(
-            fmt::format("{} ..> {} : {}", from, to, label), caseSensitivity));
+            fmt::format("{} .{}.> {}", from, style, to), caseSensitivity));
+    else
+        return ContainsMatcher(
+            CasedString(fmt::format("{} .{}.> {} : {}", from, style, to, label),
+                caseSensitivity));
 }
 
 ContainsMatcher IsConceptRequirement(std::string const &cpt,
diff --git a/tests/test_cases.yaml b/tests/test_cases.yaml
index 1b7f90b0..4a824bb8 100644
--- a/tests/test_cases.yaml
+++ b/tests/test_cases.yaml
@@ -219,6 +219,9 @@ test_cases:
     - name: t00074
       title: Test case for rendering concepts without requirements
       description:
+    - name: t00075
+      title: Test case for class diagram styles in config file
+      description:
   Sequence diagrams:
     - name: t20001
       title: Basic sequence diagram test case