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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
*{ margin:0; padding:0;}
.box{ width:350px; height:500px; background:#999; padding-top:60px; padding-left:60px;}
.box li{ float:left; list-style:none}
.box li a{ border:5px solid #aaa; display:block; width:100px; height:60px; text-decoration:none; margin:0 0 -5px -5px; position:relative; z-index:0; text-align:center; line-height:60px; color:#fff; font-size:30px;}
.box li a:hover{ border:5px solid #333; z-index:1;}
</style>
</head>
<body>
<ul class="box">
<li><a href="#">1</a></li>
<li><a href="#">2</a></li>
<li><a href="#">3</a></li>
<li><a href="#">4</a></li>
<li><a href="#">5</a></li>
<li><a href="#">6</a></li>
<li><a href="#">7</a></li>
<li><a href="#">8</a></li>
<li><a href="#">9</a></li>
<li><a href="#">10</a></li>
<li><a href="#">11</a></li>
<li><a href="#">12</a></li>
<li><a href="#">13</a></li>
<li><a href="#">14</a></li>
<li><a href="#">15</a></li>
</ul>
</body>
</html>
