<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>浮动</title>
<style type="text/css">
.box{
width: 1600px;
height: 200px;
background-color: red;
float: left;
}
.box1{
width: 200px;
height: 200px;
background-color: yellow;
float: left;
}
.box2{width: 200px;
height: 200px;
background-color: green;
float: left;
}
</style>
</head>
<body>
<div class="box"></div>
<div class="box1"></div>
<div class="box2"></div>
</body>
</html>
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