简单教程
提交运行
代码编辑器：
<meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/static/lib/bootstrap/4.0.0/css/bootstrap.min.css"> <script src="/static/lib/jquery/3.3.1/jquery.min.js"></script> <script src="/static/lib/popper.js/1.12.9/umd/popper.min.js"></script> <script src="/static/lib/bootstrap/4.0.0/js/bootstrap.min.js"></script> <div class="container"> <p>Bootstrap 4 重置了所有的 HTML 标题 (h1 到 h6 )的样式</p> <h1>h1 Bootstrap 标题 (2.5rem = 40px)</h1> <h2>h2 Bootstrap 标题 (2rem = 32px)</h2> <h3>h3 Bootstrap 标题 (1.75rem = 28px)</h3> <h4>h4 Bootstrap 标题 (1.5rem = 24px)</h4> <h5>h5 Bootstrap 标题 (1.25rem = 20px)</h5> <h6>h6 Bootstrap 标题 (1rem = 16px)</h6> </div>
运行结果：