展开全部
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<style type="text/css">
.container{
width: 250px;
margin: 0 auto;
}
.big-box{
width: 250px;
height: 48px;
border: 2px solid #000;
}
.small-box-left{
float: left;
width: 100px;
height: 48px;
border: 2px solid #000;
}
.small-box-right{
float: right;
width: 100px;
height: 48px;
border: 2px solid #000;
}
.center{
width: 100%;
height: 52px;
margin: 10px 0;}
</style>
<body>
<div class="container">
<div class="big-box"></div>
<div class="center">
<div class="small-box-left"></div>
<div class="small-box-right"></div>
</div>
<div class="big-box "></div>
</div>
</body>
</html>
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