漂亮的雪花图案：
<!DOCTYPE HTML> <html> <head> <meta charset="UTF-8"> <title>CSSAAA TEST DEMO</title> <style type="text/css"> #snow { margin:160px;position:relative; width:200px;height:20px; border-radius:25px; background-color:#09f; } .flake { position:absolute;left:0;right:0;top:0;bottom:0;margin:auto; width:35px;height:10px;border-radius:10px; } #snow:before, #snow:after, .flake:before, .flake:after { content:" ";position:absolute; width:inherit;height:inherit; border-radius:inherit; background-color:inherit; } #snow:before, .flake:before { transform:rotate(-60deg); } #snow:after, .flake:after { transform:rotate(60deg); } .flake, .flake:before, .flake:after { box-shadow:45px 50px 0 2px #09f,-45px -50px 0 2px #09f, 45px -50px 0 2px #09f,-45px 50px 0 2px #09f; } </style> <script src="https://cdn.bootcss.com/prefixfree/1.0.7/prefixfree.min.js"></script> </head> <body> <div id="snow"> <div class="flake"></div> </div> </body> </html>代码来自：http://www.cssaaa.com/css3/158.html
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