<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> html, body { height: 100%; } .div { position: absolute; /*height: 200px;*/ width: 800px; background: yellow; margin: 0 auto; top: 0; left: 0; bottom: 0; right: 0; /*margin-top: -100px;*/ } </style> </head> <body> <div class="div"></div> </body> </html>
原文：http://www.cnblogs.com/lhl66/p/7475538.html