Add initial version of the application's UI.

app.css

@@ -0,0 +1,104 @@
+/* * * * * * * * * * *
+ * Split js theming. *
+ * * * * * * * * * * */
+
+html, body {
+  height: 100%;
+}
+body {
+  /* padding: 8px; */
+  margin: 0;
+  /*background-color: #F6F6F6;*/
+  box-sizing: border-box;
+}
+.split {
+  -webkit-box-sizing: border-box;
+  -moz-box-sizing: border-box;
+  box-sizing: border-box;
+  overflow-y: auto;
+  overflow-x: hidden;
+}
+.content {
+  border: 1px solid #C0C0C0;
+  box-shadow: inset 0 1px 2px #e4e4e4;
+  background-color: #fff;
+}
+.gutter {
+  background-color: #eee;
+  background-repeat: no-repeat;
+  background-position: 50%;
+}
+.gutter.gutter-horizontal {
+  cursor: col-resize;
+   background-image: url('./images/grips/vertical.png');
+}
+.gutter.gutter-vertical {
+  cursor: row-resize;
+   background-image: url('./images/grips/horizontal.png');
+}
+.split.split-horizontal, .gutter.gutter-horizontal {
+  height: 100%;
+  float: left;
+}
+
+#sidebar-menu ul {
+  padding-left: 15px;
+}
+
+#sidebar-menu ul li {
+  list-style: none;
+  padding: 0;
+}
+
+.pane-title {
+  margin-bottom: 1em;
+}
+
+.keymap__name.active,
+.keymap__abbrev.active {
+  box-shadow: 0 0 0px 1px #ccc, 0 0 5px 0px #ccc;
+  padding: 0 .5rem;
+  margin: 0 -.5rem;
+}
+
+.keymap__name,
+.keymap__abbrev {
+  border-bottom: 2px dotted #999;
+}
+
+.keymap__abbrev,
+.keymap__abbrev.active {
+  padding: 0 .5rem;
+  margin: 0 .25rem;
+}
+
+.keymap__is-default.fa-star {
+  color: #ffd700;
+}
+
+.keymap__is-default.fa-star-o {
+  color: #000;
+}
+
+.keymap__is-default:hover {
+  color: #ffd700;
+  cursor: pointer;
+}
+
+.unk--wrapper {
+  /*margin-top: 10rem;*/
+}
+
+.uhk {
+  max-width: 100%;
+}
+
+.owl-carousel .item img {
+  display: block;
+  width: 100%;
+  height: auto;
+}
+
+.btn:not(.btn-primary) {
+  border: none;
+}