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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/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>边框圆角</h2> <p>请使用 rounded 类为元素添加圆角：</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> <span class="rounded-circle"></span> <span class="rounded-pill" style="width:130px"></span> <span class="rounded-0"></span> <span class="rounded-1"></span> <span class="rounded-2"></span> <span class="rounded-3"></span> </div> </body> </html>