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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 rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script></head><body> <div class="container mt-3"> <h2>Flex</h2> <p>To create a flexbox container, add the d-flex class. Use any of the d-*-flex classes to control WHEN the element should be a flex element on a specific screen width.</p> <p>Resize the browser window to see the effect.</p> <div class="d-flex bg-success">d-flex</div> <span class="d-sm-flex bg-success">d-sm-flex</span> <span class="d-md-flex bg-success">d-md-flex</span> <span class="d-lg-flex bg-success">d-lg-flex</span> <span class="d-xl-flex bg-success">d-xl-flex</span></div></body></html>