"

From 2014.igem.org

1. menu {

 background: #333;
 height: 30px;

}

1. menu ul {

 margin:0;padding:0;
 position:absolute;
 width:100%;

}

1. menu ul a {

 text-decoration: none;

}

1. menu ul li {

 list-style: none;
 float: left;
 position: relative;
 width: calc(1/3*100)%;

}

1. menu ul li a {

 background: #333;
 color: #fff;
 border: 1px solid #333;
 display: block;
 padding: 4px;
 width:100%;

}

1. menu ul ul {

 padding:0;
 overflow: hidden;

}

1. menu ul ul li {

 float: none;
 display: none;
 border-bottom: 1px solid #ccc;
 border-left: 1px solid #ccc;
 border-right: 1px solid #ccc;  

}

1. menu ul ul li a {

 background: #f0f0f0;
 color: #333;
 border:none;

}

1. menu ul ul li a:hover {

 background: #ccc;

}

1. menu ul li a:hover,
2. menu ul li:hover ul li {

 display:block !important;

}