html这个怎么弄

<!DOCTYPE html>
<html>
<head>
<title>2</title>
<style>
.box{
width:920px;
height:300px;
background:gray;
margin:0 auto;
}
.box>div.left{
width:450px;
height:300px;
background:red;
float:left;
}
.box>div.right{
width:450px;
height:300px;
background:blue;
float:left;
}
</style>
</head>
<body>
<div class="box">
<div class="left">left</div>
<div class="right">right</div>
</div>
</body>
</html>

ITMISS

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