From 2007.igem.org

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#tabs {
/*	float:left; */
	position:relative;
	left:60px;
	width:800px; 
	background:#ffffff;
	font-size:120%;
	font-weight:bold;
	line-height:normal;
/*	border-bottom:1px solid #666;*/
}

#tabs ul {
	margin:0;
	padding:10px 10px 0 50px;
	list-style:none;
}

#tabs li {
	display:inline;
	margin:0;
	padding:0;
}

#tabs a {
	float:left;
	background:url("https://static.igem.org/mediawiki/2007/f/f3/IC07_tableft.gif") no-repeat left top;
	margin:0;
	padding:0 0 0 4px;
	text-decoration:none;
}

#tabs a span {
	float:left;
	display:block;
	background:url("https://static.igem.org/mediawiki/2007/e/e4/IC07_tabright.gif") no-repeat right top;
	padding:5px 15px 4px 6px;
	color:#666;
}

#tabs a:hover span {
	color:#FFF;
}

#tabs a:hover {
	background-position:0% -42px;
}

#tabs a:hover span {
	background-position:100% -42px;
}