bootstrap4 在线编辑器 | bootstrap4代码测试

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap 示例</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://www.cainiaomax.com/lib/bootstrap/4.5.2/css/bootstrap.min.css">
  <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.5.1.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
  <script src="https://www.cainiaomax.com/lib/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container mt-3">
  <h2>显示表格</h2>
  <p>使用 d-table、d-table-row 和 d-table-cell 使元素显示为表格：</p>
  <div class="d-table" style="width:100%">
    <div class="d-table-row" style="width:100%">

<div class="d-table-cell">
  	  	<h4>中间单元格</h4>
  	  	<p>一些文字..</p>
    	</div>

</div>
  </div>
</div>

</body>
</html>

报个问题: