解决方法
我想我找到了一种方法.查看
http://jsfiddle.net/RE4A7/
HTML
<ul> <li><h3>Mission</h3> </li> </ul>
CSS
ul h3 { font-size:1.2em; font-family:arial; border-bottom:1px solid #333; padding-bottom:10px; position:relative; width:250px; } ul li { list-style:none; } ul h3:after { border-bottom:1px solid #ff4800; bottom:-1px; left:0px; content:""; position:absolute; width:55px; }