Refactor general list styles as it was to specific. #5.

css/app.css

@@ -8,10 +8,11 @@
   overflow-y: auto;
   width: 250px;
   height: 100%; }
-  #sidebar-menu ul {
+
+ul {
   padding: 0;
   margin: 0; }
-    #sidebar-menu ul li {
+  ul li {
     list-style: none;
     padding: 0; }
 

sass/app.scss

@@ -9,6 +9,7 @@
   overflow-y: auto;
   width: 250px;
   height: 100%;
+}
 
 // General list styles for the sidebar-menu.
 ul {
@@ -20,7 +21,6 @@
     padding: 0;
   }
 }
-}
 
 .sidebar {
   &__level-1 {