Improve frontpage menu styles.

Closes: #952

www/assets/css/src/default.css

@@ -233,6 +233,13 @@ This styles the menu heading.
     color: #fff;
     margin: 0;
 }
+.frontpage-menu .pure-menu-item {
+    border-bottom: 1px solid lightgrey;
+}
+.frontpage-menu .pure-menu-selected {
+    border-bottom: 1px solid black;
+    font-weight: bold;
+}
 
 /* -- Dynamic Button For Responsive Menu -------------------------------------*/
 
@@ -362,12 +369,6 @@ CONTENT
     margin-top: 2em;
     width: 35%;
 }
-.pure-menu-item {
-    border-bottom: 1px solid lightgrey;
-}
-.pure-menu-item:last-child {
-    border-bottom: none;
-}
 .code-box{
     border:1px solid #ccc;
     margin-bottom: 1em;