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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#div1{
width: 500px;
height: 300px;
margin: 100px auto;
border: 1px solid black;
}
#div1::after{
content: "";
display: block;
clear: both;
}
#div2{
width: 100%;
height: 200px;
border: 1px solid blue;
box-sizing: border-box;
}
#text{
float: left;
}
#button{
float: right;
}
</style>
</head>
<body>
<div id="div1">
<div id="div2"></div>
<input type="text" id="text">
<input type="button" value="点击" id="button">
</div>
</body>
</html>