<!doctype html>
<html >
<head>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
</head>
<body>
<div class="container">
<!--h1设置字体大小 -->
<div class="h1">hello-botootstap</div>
<!--在底部加了一条下化纤 -->
<div class="h1 page-header">hello-demo1</div>
<!--文本举重 -->
<div class="h1 page-header text-center">hello-demo1</div>
</div>
</body>
</html>
效果图：