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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 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> </head> <body> <div class="container mt-3"> <h1>阴影</h1> <p>请使用 shadow- 类为元素添加阴影：</p> <div class="shadow-none p-4 mb-4 bg-light">没有阴影</div> <div class="shadow-sm p-4 mb-4 bg-white">小型阴影</div> <div class="shadow p-4 mb-4 bg-white">默认阴影</div> <div class="shadow-lg p-4 mb-4 bg-white">大型阴影</div> </div> </body> </html>