<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Div标签的嵌套</title>
<style type="text/css">
.inline_div{display: inline-block; /* 行内显示方式，设置以后两个div区块就同一行显示啦 */}
#wrap{width: 450px; height: 250px; border: 2px solid black;}
#d1,#d2{height: 100px; width: 40%; background-color: green; margin: 20px;} /* margin表示的是边距，auto为居中，一个参数为四边，两个为左右上下，四个为上下左右都设置 */
#d2{background-color: yellow;}
#d3{height: 100px; width: 90%; border: 2px solid black; background-color: #66ff33; margin: 0px auto;}
h3{font-size: 28px; color: #0033ff;}
</style>
</head>
<body>
<h3>图层嵌套的应用</h3>
<div id="wrap">
<div id="d1" class="inline_div">div1</div>
<div id="d2" class="inline_div">div2</div>
<div id="d3">div3</div>
</div>
</body>
</html>
