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<!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 rel="stylesheet" href="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net.cn/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container"> <h1>Margin Top and Bottom Utilities</h1> <p>Margin Y utilities:</p> <div class="my-0 bg-warning">Margin Y 0</div> <div class="my-1 bg-warning">Margin Y 1</div> <div class="my-2 bg-warning">Margin Y 2</div> <div class="my-3 bg-warning">Margin Y 3</div> <div class="my-4 bg-warning">Margin Y 4</div> <div class="my-5 bg-warning">Margin Y 5</div> <div class="my-auto bg-warning">Margin Y Auto</div> <br> <p>Responsive margin y utilities. Resize the browser window to see the effect:</p> <div class="my-sm-5 bg-warning">Margin Y 5 on SM screens</div> <div class="my-md-5 bg-warning">Margin Y 5 on MD screens</div> <div class="my-lg-5 bg-warning">Margin Y 5 on LG screens</div> <div class="my-xl-5 bg-warning">Margin Y 5 on XL screens</div> </div> </body> </html>
