body { width: 600px; height: 500px; border: 10px solid #789; margin: 10px 100px; padding: 40px; background: pink url("/images/shanghai_lupu_bridge.jpg") no-repeat; /*background: url("/images/eg_tulip.jpg") no-repeat; background-origin: content-box; background-position: right;*/ background-position: center; }
body里设置background-image后，body的宽和高无法约束image的位置；
但其他标签可以约束image的位置，如下：
.zhujieshao { width: 100px; height: 140px; padding: 20px; border: 6px solid #18E; background: url("/images/shanghai_lupu_bridge.jpg") no-repeat; background-position: left bottom; background-origin: content-box; float: left; }
完整代码：
<html> <head> <title>TODO supply a title</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width"> <style type="text/css"> body { width: 600px; height: 500px; border: 10px solid #789; margin: 10px 100px; padding: 40px; background: pink url("/images/shanghai_lupu_bridge.jpg") no-repeat; /*background: url("/images/eg_tulip.jpg") no-repeat; background-origin: content-box; background-position: right;*/ background-position: center; } #header { border: 1px solid #14C; width: 550px; height: 450px; margin: 0 auto; background: url("/images/eg_tulip.jpg") no-repeat; } .zhujieshao { width: 100px; height: 140px; padding: 20px; border: 6px solid #18E; background: url("/images/shanghai_lupu_bridge.jpg") no-repeat; background-position: left bottom; background-origin: content-box; float: left; } </style> </head> <body id="er"> <div id="header"> <div class="zhujieshao" id="content1"></div> <div class="zhujieshao" id="content2"></div> <div class="zhujieshao" id="content3"></div> <div class="zhujieshao" id="content4"></div> <div class="zhujieshao" id="content5"></div> <div class="zhujieshao" id="content6"></div> </div> </body> </html>
原文：http://www.cnblogs.com/ouyangfeifei/p/5995079.html