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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>测试css</title>
</head>
<body>
<div style="position:relative; width:300px; height:200px; border:solid 1px #000000">
<div style="position:relative; width:auto; margin:10px;height:auto; border:solid 1px #FF0000">
asdfdsaf
</div>
</div>
</body>
</html>
#lay{
background:black;
width:250px;
height:100%;
overflow:auto;
}
#innerlay{
width:auto;
height:100px;
margin: 10px 10px;
background: white;
}
<div style="position:relative; width:300px; height:200px; border:solid 1px #000000; padding:10px 10px 12px 10px;">
<div style="width:auto; height:100%; border:solid 1px #FF0000;">
asdfdsaf
</div>
</div>