<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#v{
width:300px;
height:300px;
background-color:red;
border: 20px solid yellow;
padding:30PX;
}
#f{
width:80px;
height:80px;
background-color:green;
border: 20px solid yellow;
margin:80px auto;
}
#box{
width:280px;
height:280px;
background-color:blue;
/*border:solid red;*/
padding:10px;
}
</style>
</head>
<body>
<div id="v">
<div id="box">
<div id="f">
</div>
</div>
</div>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset=
阅读背景：
边框 内边距及外边距
来源：互联网
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