<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<div class="container mt-3">
<h1>上内边距 Utility</h1>
<div class="pt-0 bg-warning">Padding Top 0</div>
<div class="pt-1 bg-success">Padding Top 1</div>
<div class="pt-2 bg-danger">Padding Top 2</div>
<div class="pt-3 bg-primary">Padding Top 3</div>
<div class="pt-4 bg-light">Padding Top 4</div>
<div class="pt-5 bg-info">Padding Top 5</div>
<br>
<p>响应式上内边距实用工具。请调整浏览器窗口大小以查看效果：</p>
<div class="pt-sm-5 bg-warning">在 SM 屏幕上的 Padding Top 5</div>
<div class="pt-md-5 bg-success">在 MD 屏幕上的 Padding Top 5</div>
<div class="pt-lg-5 bg-danger">在 LG 屏幕上的 Padding Top 5</div>
<div class="pt-xl-5 bg-primary">在 XL 屏幕上的 Padding Top 5</div>
</div>
</body>
</html>