<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<title>后台登陆
</title>
<style type="text/css">
body{background:#000;}
@media(min-width:767px) and (max-width:979px){body{background:red;}}
</style>
</head>
<body>
</body>
</html>
转载于:https://www.cnblogs.com/zoro-zero/p/4025428.html
相关资源：自适应css布局——流动布局新时代
