<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
.box{width: 400px;height: 300px;}
</style>
</head>
<body>
<div class="box">
<h1>全局css样式</h1>
<div class="box1">
<h1>h1.Bootstrap heading</h1>
<h2>h2.Bootstrap heading</h2>
<h3>h3.Bootstrap heading</h3>
<h4>h4.Bootstrap heading</h4>
<h5>h5.Bootstrap 哈哈 heading</h5>
<h6>h6.Bootstrap heading</h6>
</div>
<div class="box2">
<p></p>
</div>
</div>
</body>
</html>