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From 2012.igem.org

1. navigation { width: 100%; font-size: 95%; }
2. navigation, #navigation ul, #navigation ul li, #navigation ul li a { margin: 0; }
3. navigation, #navigation ul { padding: 0; }
4. navigation ul li a , #navigation ul li { display: block; float: left; }
5. navigation ul { list-style: none; background: url(../images/menubg.gif) repeat-x 0 50%; overflow: hidden; border: 1px solid #1f1f1f; }
6. navigation ul li { padding: 0 2px 0 0; background: url(../images/separator.gif) no-repeat 100% 50%; }
7. navigation ul li a { color: #fff; font-weight: bold; text-decoration: none; }
8. navigation ul li a:link, #navigation ul li a:visited { padding: 7px 10px; }
9. navigation ul li a:hover, #navigation ul li a:active { background: url(../images/menubg_h.gif) repeat-x 0 50%; }