如何在div中嵌入div
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type"content="text/html;charset=utf-8">
<title>盒子布局</title>
<style type="text/css">
.box1{height: 500px;width: 800px;background: red;float: left; }
.box2{height: 500px;width: 600px;background:blue;float: right;}
.box3{height: 500px;width: 600px;background:blue;float: left;}
</div>
</style>
</head>
<body>
<div>
<div class="box1">1</div>
<div calss="box3">3</div>
</div>
<div class="box2">2sadddddd </div>
</body>
</html>
