<!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=gb2312" />
<title>css定位布局_相对定位</title>
<style type="text/css">
#body,div{
margin:0;
padding:0;
}
#main{
width:500px;
height:500px;
border:1px solid black;
margin:0 auto;
}
#one,#two,#three{
width:100px;
height:100px;
background:red;
}
#two{
background:green;
position:relative;
top:100px;
left:100px;
}
#three{
background:blue;
position:relative;
top:-100px;
left:100px;
}
</style>
</head>
<body>
<div id="main">
<div id="one">1</div>
<div id="two">2</div>
<div id="three">3</div>
</div>
</body>
</html>
原文：http://1154179272.blog.51cto.com/10217799/1657199