#nav { font-size: 1em;  background: #333; }

#nav li { position:relative; text-align:left; }
#nav li.over { z-index:999; }
#nav a { border-bottom: 4px solid #dcdcdc; text-decoration: none; }
#nav a:hover { display:block; border-bottom: 4px solid #a6a6a6; }

#nav li { float:left; }
#nav li.active a { color:#fff; border-bottom: 4px solid #a6a6a6; background: #484848; }
#nav a { float:left; padding:5px 13px 5px 13px; font-weight:bold; color:#fff; }
#nav li.over a,
#nav a:hover { color:#fff; background: #484848; }