"

From 2014.igem.org

1. menu {

   width: 100%;
   margin: 0;
   padding: 10px 0 0 0;
   list-style: none;  
   background-color: #111;
   background-image: linear-gradient(#444, #111);
   border-radius: 50px;
   box-shadow: 0 2px 1px #9c9c9c;

}

1. menu li {

   float: left;
   padding: 0 0 10px 0;
   position: relative;

}

1. menu a {

   float: left;
   height: 25px;
   padding: 0 25px;
   color: #999;
   text-transform: uppercase;
   font: bold 12px/25px Arial, Helvetica;
   text-decoration: none;
   text-shadow: 0 1px 0 #000;

}

1. menu li:hover > a {

   color: #fafafa;

}

• html #menu li a:hover { /* IE6 */

   color: #fafafa;

}

1. menu li:hover > ul {

   display: block;

}

/* Sub-menu */

1. menu ul {

   list-style: none;
   margin: 0;
   padding: 0;    
   display: none;
   position: absolute;
   top: 35px;
   left: 0;
   z-index: 99999;    
   background-color: #444;   
   background-image: linear-gradient(#444, #111);    
   -moz-border-radius: 5px;
   border-radius: 5px;

}

1. menu ul li {

   float: none;
   margin: 0;
   padding: 0;
   display: block;  
   box-shadow: 0 1px 0 #111111, 
               0 2px 0 #777777;

}

1. menu ul li:last-child {

   box-shadow: none;    

}

1. menu ul a {

   padding: 10px;
   height: auto;
   line-height: 1;
   display: block;
   white-space: nowrap;
   float: none;
   text-transform: none;

}

• html #menu ul a { /* IE6 */

   height: 10px;
   width: 150px;

}

• first-child+html #menu ul a { /* IE7 */

   height: 10px;
   width: 150px;

}

1. menu ul a:hover {

   background-color: #0186ba;
   background-image: linear-gradient(#04acec, #0186ba);

}

1. menu ul li:first-child a {

   border-radius: 5px 5px 0 0;

}

1. menu ul li:first-child a:after {

   content: ;
   position: absolute;
   left: 30px;
   top: -8px;
   width: 0;
   height: 0;
   border-left: 5px solid transparent;
   border-right: 5px solid transparent;
   border-bottom: 8px solid #444;

}

1. menu ul li:first-child a:hover:after {

   border-bottom-color: #04acec; 

}

1. menu ul li:last-child a {

   border-radius: 0 0 5px 5px;

}

/* Clear floated elements */

1. menu:after {

   visibility: hidden;
   display: block;
   font-size: 0;
   content: " ";
   clear: both;
   height: 0;

}

1. menu ul li:first-child a:after {

   content: ;
   position: absolute;
   left: 30px;
   top: -8px;
   width: 0;
   height: 0;
   border-left: 5px solid transparent;
   border-right: 5px solid transparent;
   border-bottom: 8px solid #444;

}

1. menu ul li:first-child a:hover:after {

   border-bottom-color: #04acec; 

}