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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>
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float:left;
width: 100%;
height:100%;
background-color:#f99;
margin-top:30px;
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float:left;
width: 680px;
height:200px;
background-color:#f90;
margin-top:30px;
padding:50px;
}
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</head>
<body>
<div id="box">
<div class="box_child"></div>
<div class="box_child"></div>
</div>
</body>
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