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#n { width:960px; height:84px; margin:0 auto; padding:0px; background-color:Green;}
#n1 { width:230px; height:84px; margin:0px; padding:0px; float:left; background-color:Red;}
#n2 { width:470px; height:84px; margin:0px; padding:0px; float:left; background-color:Yellow;}
#n3 { width:200px; height:84px; margin:0px; padding:0px; float:right; background-color:Black;}
#f { width:960px; height:70px; margin:0 auto; padding:0px; background-color:Blue; }
<div id ="n">
<div id="n1"></div>
<div id="n2"></div>
<div id="n3"></div>
</div>
<div id = "f">
</div>
<!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>divtest</title>
<style type="text/css">
/**----------------------------------body styles----------------------------------------**/
#n {width:960px; height:84px; margin:0 auto; padding:0px; background-color:Green;}
#n1 { width:230px; height:84px; margin:0px; padding:0px; float:left; background-color:Red;}
#n2 { width:530px; height:84px; margin:0px; padding:0px; float:left; background-color:Yellow;}
#n3 { width:200px; height:84px; margin:0px; padding:0px; float:right; background-color:Black;}
#f { width:960px; height:70px; margin:0 auto; padding:0px; background-color:Blue; }
.clearfix:after {content:".";display:block;height:0;clear:both;visibility:hidden;}
*html .clearfix{height:1%;}
*+html .clearfix{height:1%;}
.clearfix{display:inline-block;}
/* Hide from IE Mac */
.clearfix {display:block;}
</style>
</head>
<body>
<div id ="n" class="clearfix">
<div id="n1"></div>
<div id="n2"></div>
<div id="n3"></div>
</div>
<div id = "f">
</div>
</body>
</html>