<html>
<head>
<title>HTML示例</title>
<style type="text/css">
div{
width:200px;
height:150px;
border:2px solid purple;
}
#div51{
background-color:blue;
position:absolute;
top:50px;
left:100px;
}
#div52{
background-color:gray;
}
#div53{
background-color:purple;
}
</style>
</head>
<body>
<div id="div51">AAAAAAAAAA</div>
<div id="div52">BBBBBBBBBB</div>
<div id="div53">CCCCCCCCCC</div>
</body>
</html>
原文：https://www.cnblogs.com/felixyiding/p/13735202.html