为什么我在dreamreaver cs5.5下会显示出不一样的图形
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<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>
<style type="text/css">
*{margin:0;padding:0;}
#wrap{background:#00c;margin:0 auto;width:960px;}
#header{background:#ff3300;width:100%;}
#mainbody{background:#fc0;width:100%;overflow:hidden;}
.left{width:800px;height:200px;background:#000;float:left;}
.right{winth:120px;height:500px;background:#690;float:left;}
#footer{background:#639;width:100%;}
</style>
</head>
<body>
<div id="wrap">
<div id="header">头部</div>
<div id="mainbody">主题内容</div>
<div class="left">left</div>
<div class="right">right</div>
<div id="footer">版权</div>
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