<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.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> </head> <style> .front{ background-repeat:repeat-x !important;}<!--important 优先级最高，（可以防止被其他样式覆盖）--> .back{ width:800px; height:6000px; border:1px solid #F00; background-image:url(png.png) ; background-position:-100px -100px; background-repeat:no-repeat;} /*.back{ 800px; height:600px; background:url(png.png) no-repeat left top ; border:1px solid #F00}*/ </style> <body> <div class="back front"> </div> </body> </html>