<html>
<head>
<title>123</title>
<style>
#sub1{
width:50px;
height:80px;
border:1px solid #dcdcdc;
}
#sub2{
position:fixed;
top:250px;
right:20px;
width:50px;
height:80px;
border:1px solid #dcdcdc;
margin-top:5px;
}
#sub3{
width:250px;
height:880px;
border:1px solid #dcdcdc;
margin-top:5px;
}
</style>
</head>
<body>
<div id="parent">
<div id="sub1">sub1</div>
<div id="sub2">sub2</div>
<div id="sub3">sub1</div>
</div>
</body>
</html>
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