<title>Bootstrap 实例</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.net/popper.js/1.15.0/umd/popper.min.js"></script>
<script src="https://cdn.staticfile.net/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<p>使用 .small 类让段落字体更小：</p>
<p class="small">这个段落字体更小。</p>
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