<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<style type="text/css">
h1{
background-color:green;
padding-top:20px;
padding-right:23px;
padding-left:34px;
padding-bottom:21px;
width:200px;
height:200px;
}
</style>
<style type="text/css">
h2{
background-color:red;
margin:4em;
}
</style>
<body>
<p>CSS盒模型</p>
<h1>CSS内边距</h1>
<h2>CSS外边距</h1>
</body>
</html>
标签：color,padding,background,外边,200px,CSS,属性 From： https://blog.51cto.com/u_15988249/6253311