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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-fluid"> <h1>Responsive Columns</h1> <p>Resize the browser window to see the effect.</p> <p>The columns will automatically stack on top of each other when the screen is less than 576px wide.</p> <div class="row"> <div class="col-sm-3" style="background-color:lavender;">.col-sm-3</div> <div class="col-sm-3" style="background-color:lavenderblush;">.col-sm-3</div> <div class="col-sm-3" style="background-color:lavender;">.col-sm-3</div> <div class="col-sm-3" style="background-color:lavenderblush;">.col-sm-3</div> </div></div></body></html>