.mainmenu,
        .submenu {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        /* make ALL links (main and submenu) have padding and background color */
        
        .mainmenu a {
            display: block;
            background-color: white;
            text-decoration: none;
            padding: 10px;
            color: #000;
        }
        /* add hover behaviour */
        
        .mainmenu a:hover {
            background-color: #C5C5C5;
        }
        /* when hovering over a .mainmenu item,
  display the submenu inside it.
  we're changing the submenu's max-height from 0 to 200px;
*/
        
        .mainmenu li:hover .submenu {
            display: block;
            max-height: 200px;
        }
        /*
  we now overwrite the background-color for .submenu links only.
  CSS reads down the page, so code at the bottom will overwrite the code at the top.
*/
        
        .submenu a {
            background-color: #ccc;
        }
        /* hover behaviour for links inside .submenu */
        
        .submenu a:hover {
            background-color:#999;
        }
        /* this is the initial state of all submenus.
  we set it to max-height: 0, and hide the overflowed content.
*/
        
        .submenu {
            overflow: hidden;
            max-height: 0;
            -webkit-transition: all 0.5s ease-out;
        }