<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
.aa{ width:100px; height:100px; overflow:hidden; background:#333; float:left; margin-left:10px;}
.bb,.cc{ width:100px; height:60px; padding-top:40px; display:inline-block; text-align:center;}
.cc{ font-size:15px; background:#F30;transition-delay:0; transition-duration:0.5s; transition-property:all;}
.aa:hover > .cc{ -moz-transform:translateY(-100%)}
</style>
</head>
<body>
<div class="aa">
<span class="bb">AA</span>
<span class="cc">CC</span>
</div>
<div class="aa">
<span class="bb">AA</span>
<span class="cc">CC</span>
</div>
<div class="aa">
<span class="bb">AA</span>
<span class="cc">CC</span>
</div>
</body>
</html>原文：http://maobin.blog.51cto.com/6335599/1359132