小视频软件开发,实现一个CSS边框动画
小视频软件开发,实现一个CSS边框动画
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <style> * { margin: 0; padding: 0; list-style: none; --transition-duration: 500ms; } .box { width: 500px; height: 300px; background-color: #000; padding: 10px; position: relative; } .box::before { position: absolute; content: ''; display: inline-block; top: 10px; left: 10px; width: 0; height: 1px; background-color: #fff; transition: all ease var(--transition-duration); transition-delay: 0s; } .box::after { position: absolute; content: ''; display: inline-block; bottom: 10px; left: 10px; width: 0; height: 1px; background-color: #fff; transition: all ease var(--transition-duration); transition-delay: calc(var(--transition-duration)/1.25); } .box div { width: 100%; height: 100%; position: relative; } .content::before { position: absolute; content: ''; display: inline-block; bottom: 0; left: 0; width: 1px; height: 0; background-color: #fff; transition: all ease var(--transition-duration); transition-delay: calc(var(--transition-duration)/1.25); } .content::after { position: absolute; content: ''; display: inline-block; bottom: 0; right: 0; width: 1px; height: 0; background-color: #fff; transition: all ease var(--transition-duration); transition-delay: 0s; } .box:hover::after, .box:hover::before { width: 500px; } .content:hover::after, .content:hover::before { height: 100%; } .box:hover::before, .content:hover::after { transition-delay: calc(var(--transition-duration)/1.25); } .box:hover::after, .content:hover::before { transition-delay: 0s; } </style> </head> <body> <div class="box"> <div class="content"> </div> </div> </body> </html>
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