From 2012.igem.org
ul.topnav {
list-style: none;
padding: 0 20px;
margin: 0;
float: left;
width: 993px;
background: #222;
font-size: 1.2em;
background: url('https://static.igem.org/mediawiki/2012/1/1b/Topnav_bg.gif') repeat-x;
}
ul.topnav li {
float: left;
margin: 0;
padding: 0 15px 0 0;
position: relative; /*--Declare X and Y axis base for sub navigation--*/
}
ul.topnav li a{
padding: 10px 5px;
color: #fff;
display: block;
text-decoration: none;
float: left;
}
ul.topnav li a:hover{
background: url('https://static.igem.org/mediawiki/2012/f/f5/Topnav_hover.gif') no-repeat center top;
}
ul.topnav li span { /*--Drop down trigger styles--*/
width: 17px;
height: 35px;
float: left;
background: url('https://static.igem.org/mediawiki/2012/4/45/Subnav_btn.gif') no-repeat center top;
}
ul.topnav li span.subhover {background-position: center bottombottom; cursor: pointer;} /*--Hover effect for trigger--*/
ul.topnav li ul.subnav {
list-style: none;
position: absolute; /*--Important - Keeps subnav from affecting main navigation flow--*/
left: 0; top: 35px;
background: #333;
margin: 0; padding: 0;
display: none;
float: left;
width: 170px;
border: 1px solid #111;
}
ul.topnav li ul.subnav li{
margin: 0; padding: 0;
border-top: 1px solid #252525; /*--Create bevel effect--*/
border-bottom: 1px solid #444; /*--Create bevel effect--*/
clear: both;
width: 170px;
}
html ul.topnav li ul.subnav li a {
float: left;
width: 145px;
background: #333 url('https://static.igem.org/mediawiki/2012/4/4b/Dropdown_linkbg.gif') no-repeat 10px center;
padding-left: 20px;
}
html ul.topnav li ul.subnav li a:hover { /*--Hover effect for subnav links--*/
background: #222 url('https://static.igem.org/mediawiki/2012/4/4b/Dropdown_linkbg.gif') no-repeat 10px center;
}
"
