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<!DOCTYPE html> <html> <head> <style> .container { position: relative; width: 50%; } .image { display: block; width: 100%; height: auto; } .overlay { position: absolute; bottom: 100%; left: 0; right: 0; background-color: #008CBA; overflow: hidden; width: 100%; height: 0; transition: .5s ease; } .container:hover .overlay { bottom: 0; height: 100%; } .text { white-space: nowrap; color: white; font-size: 20px; position: absolute; overflow: hidden; top: 50%; left: 50%; transform: translate(-50%, -50%); -ms-transform: translate(-50%, -50%); } </style> </head> <body> <h2>从顶部滑入叠加层</h2> <div class="container"> <img src="/demo/images/img_avatar.png" alt="头像" class="image"> <div class="overlay"> <div class="text">Hello World</div> </div> </div> </body> </html>