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<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@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script></head><body> <div class="container pt-3"> <h1>Responsive Containers</h1> <p>Resize the browser window to see the effect.</p></div><div class="container-sm border">.container-sm</div><div class="container-md mt-3 border">.container-md</div><div class="container-lg mt-3 border">.container-lg</div><div class="container-xl mt-3 border">.container-xl</div><div class="container-xxl mt-3 border">.container-xxl</div></body></html>