css 让div 的高度和屏幕的高度一样

<html>
<head>
<title>无标题文档</title>
<style type="text/css">
html,body{height:100%; 100%; overflow:hidden; margin:0;
padding:0;}
.main{100%; height:100%; overflow:hidden; margin:0;
padding:0;}
.a1{100%; height:80px; color:#fff;
background-color:#369; text-align:center;}
.a2{100%; height:100%; color:#fff;
background-color:#FF0000; text-align:center;"}
</style>
</head>
<body>
<div class="main">
<div
class="a2">div2</div>
</div>
</body>
</html>

原文地址:https://www.cnblogs.com/ch-zaizai/p/6322751.html