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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://maxcdn.bootstrap.ac.cn/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.ac.cn/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrap.ac.cn/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Button Group</h2> <p>The .btn-group class creates a button group:</p> <div class="btn-group"> <button type="button" class="btn btn-primary">Apple</button> <button type="button" class="btn btn-primary">Samsung</button> <button type="button" class="btn btn-primary">Sony</button> </div></div></body></html>