add project add button to dropdown and set fixed height, fixes ST-170

resources/css/app.css

@@ -51,6 +51,27 @@
     -moz-osx-font-smoothing: grayscale;
 }
 
+/* width */
+::-webkit-scrollbar {
+    width: 5px;
+}
+
+/* Track */
+::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+/* Handle */
+::-webkit-scrollbar-thumb {
+    background: #888;
+    border-radius: 2px;
+}
+
+/* Handle on hover */
+::-webkit-scrollbar-thumb:hover {
+    background: #555;
+}
+
 [x-cloak] {
     display: none;
 }