Bootstrap 实例

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap 实例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
  <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>

<h2>大的块级按钮</h2>
  <button type="button" class="btn btn-primary btn-lg btn-block">按钮 1</button>
  <button type="button" class="btn btn-default btn-lg btn-block">按钮 2</button>

<h2>小的块级按钮</h2>
  <button type="button" class="btn btn-primary btn-sm btn-block">按钮 1</button>
  <button type="button" class="btn btn-default btn-sm btn-block">按钮 2</button>
</div>

</body>
</html>