点击运行
<!DOCTYPE html> <html> <head> <style> .container { position: relative; width: 50%; } .image { display: block; width: 100%; height: auto; } .overlay { position: absolute; bottom: 0; left: 0; right: 0; background-color: #008CBA; overflow: hidden; width: 100%; height: 0; transition: .5s ease; } .container:hover .overlay { 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> <h1>滑入（从下）</h1> <div class="container"> <img src="/zy/i/css/avatar.png" alt="Avatar" class="image"> <div class="overlay"> <div class="text">Hello World</div> </div> </div> </body> </html>
运行结果
