Revert "Remove custom admin menu styling"

This reverts commit e3b1c327.

@@ -1218,6 +1218,15 @@ div.wrap > h2 {
     font-size: 25px;
 }
 
+#adminmenu > li.wp-first-item {
+    border-top: 3px solid #ddd;
+}
+
+#adminmenu > li.wp-first-item a,
+#adminmenu > li.wp-first-item.wp-menu-open {
+    border-top: none;
+}
+
 /**** Event Editing ****/
 
 div.cct-fields > .fieldset-heading:first-child {