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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> <style> span { display: inline-block; width: 70px; height: 70px; margin: 6px; background-color: #555; } </style></head><body><div class="container mt-3"> <h2>Borders</h2> <p>Round the corner of an element with the rounded classes:</p> <span class="rounded"></span> <span class="rounded-top"></span> <span class="rounded-end"></span> <span class="rounded-bottom"></span> <span class="rounded-start"></span>