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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .container { position: relative; width: 100%; max-width: 400px; } .container img { width: 100%; height: auto; } .container .btn { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); background-color: #555; color: white; font-size: 16px; padding: 12px 24px; border: none; cursor: pointer; border-radius: 5px; text-align: center; } .container .btn:hover { background-color: black; } </style> </head> <body> <h2>图片上的按钮</h2> <p>将按钮添加到图片上：</p> <div class="container"> <img src="/i/photo/mountains.jpg" alt="Mountains" style="width:100%"> <button class="btn">Button</button> </div> </body> </html>