<!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清除浮动</title>
<style type="text/css">
body,div{
margin:0;
padding:0;
}
#one{
width:100px;
height:100px;
background:blue;
float:left;
}
#two{
width:150px;
height:150px;
background:red;
float:right;
}
#three{
height:50px;
background:green;
clear:both;<!--清除上面的浮动，就是不让浮动对自己有影响-->
}
body{
width:960px;
margin:10px auto;
}
</style>
</head>
<body>
<div id="one">1</div>
<div id="two">2</div>
<div id="three">3</div>
</body>
</html>
原文：http://1154179272.blog.51cto.com/10217799/1657196