代码示例：（标识：bs_progressbar_2）
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.1.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="p-4">
<h2>进度条高度</h2>
<p>进度条的高度默认为 1rem（通常为 16px）。请使用 CSS height 属性来更改它。</p>
<div class="progress" style="height:10px">
<div class="progress-bar" style="width:40%;height:10px"></div>
</div>
<br>
<div class="progress" style="height:20px">
<div class="progress-bar" style="width:50%;height:20px"></div>
</div>
<br>
<div class="progress" style="height:30px">
<div class="progress-bar" style="width:60%;height:30px"></div>
</div>
</div>
</body>
</html>
