<!DOCTYPE html>
<html>
<head>
<title>W3.CSS(w3cschool.cn)</title>
<meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
<div class="w3-container">
<h2>移动优先响应</h2>
<p class="w3-large">尝试调整窗口大小!</p>
</div>
<div class="w3-row w3-border">
<div class="w3-threequarter w3-container w3-red">
<h2>w3-threequarter</h2>
<p>w3-threequarter 类使用75%的父容器。</p>
<p>在小于601像素的屏幕上,它将调整为全屏大小。</p>
</div>
<div class="w3-quarter w3-container">
<h2>w3-quarter</h2>
</div>
</div>
</body>
</html>