<!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>无标题文档</title> <style type="text/css"> div{ width:50px; height:20px; line-height:20px; overflow:hidden; border:1px solid red; text-align:center; } a{ wdith:50px; float:left; overflow:hidden; text-decoration:none; } span{ margin-top:-20px; display:block; } a:hover{ padding-top:20px; } </style> </head> <body> <div> <a href="#"> <span> hover</span> 默认 </a> </div> </body> </html>
原文：http://www.cnblogs.com/jinsuo/p/6062930.html