Template:York/CSS

.vertical-menu {

   width: 200em;
   height: 50%;
   overflow-y: auto;
   position: static; 
   left: 0; 
   width: 10%; 

}

.vertical-menu a {

   background-color: #eee;
   color: black;
   display: block;
   padding: 12px;
   text-decoration: none;

}

.vertical-menu a:hover {

   background-color: #ccc;

}

.vertical-menu a.active {

   background-color: #4CAF50;
   color: white;

}