W3School TIY
编辑您的代码：
<html> <head> <style type="text/css"> body { background-image: url("../i/eg_bg_03.gif"/*tpa=http://www.jb51.net/i/eg_bg_03.gif*/); background-repeat: no-repeat; background-attachment:fixed; background-position: 30% 20%; } </style> </head> <body> <p><b>注释：</b>为了在 Mozilla 中实现此效果，background-attachment 属性必须设置为 "fixed"。</p> </body> </html>
查看结果: