<html>
<head>
<meta charset="UTF-8">
<title>CSS的盒子模型</title>
<style type="text/css">
/*
border: 2px solid blue;
solid 实线,dashed 虚线
border:统一设置
边框上侧 border-top
边框下侧 border-bottom
边框左侧 border-left
边框右侧 border-right
*/
div {
width:200px;
height:100px;
/*border 边框, 2px: 线宽,solid: 实线, 线颜色*/
border:2px solid blue;
}
#divB {
/*border-right 边框右侧 dashed 虚线*/
border-right:2px dashed yellow;
/*padding 内边距 距某边距离*/
padding-top:20px;
/*外边距*/
margin:20px; /*同一设置 padding margin 都可以*/
}
</style>
</head>
<body>
<div>AAAAAAAA</div>
<div id="divB">BBBBBBBB</div>
<div>CCCCCCCC</div>
</body>
</html>