a:hover{margin-top：-10px;}沒作用
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? <style>
? .nav{position:absolute;right:10px;border-bottom:10px solid #6cf;border-radius:5px;}
? a{color:#000;width:100px;text-align: center;padding:10px;text-decoration:none;
? font-family:sans-serif;
}
? a:hover{background-color: #6cf;color:#ccc;border-radius:5px;margin-top:-10px;}
? </style>
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2017-04-23
*{margin:0; padding:0; font-size:14px;}
a{color:#333;text-decoration:none}
.nav{list-style:none; height:30px; border-bottom:10px solid #F60; margin-top:20px; padding-left:50px;}
.nav li{float:left}
.nav li a{display:block; height:30px;text-align:center; line-height:30px; width:80px; background:#efefef; margin-left:1px;}
.nav li a.on, .nav li a:hover{background:#F60;color:#fff; height:35px; line-height:35px; margin-top:-5px }
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
<ul class="nav">
? ? <li><a class="on" href="#">首 頁</a></li>
? ? <li><a href="#">博客</a></li>
? ? <li><a href="#">主題</a></li>
? ? <li><a href="#">模板</a></li>
? ? <li><a href="#">聯(lián)系</a></li>
? </ul>