<!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.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">
<h2>自动外边距</h2>
<p>使用 .ms-auto（将项目向右推）或使用 .me-auto（将项目向左推）可轻松地为弹性项目添加自动边距：</p>
<div class="d-flex mb-3 bg-secondary">
<div class="p-2 ms-auto bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 bg-primary">弹性项目 3</div>
</div>
<div class="d-flex mb-3 bg-secondary">
<div class="p-2 bg-info">弹性项目 1</div>
<div class="p-2 bg-warning">弹性项目 2</div>
<div class="p-2 me-auto bg-primary">弹性项目 3</div>
</div>
</div>
</body>
</html>