<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> body { background: black; } .play { position:relative; width: 86px; height: 86px; border: 12px solid rgba(255,255,255,.8); border-radius: 50px; box-sizing: border-box; } .play:after { content: ‘‘; position: absolute; top: 14px; left: 23px; width: 0; height: 0; border-width: 17px 0 17px 27px; border-color: transparent rgba(255,255,255,.8); border-style: dashed solid; } </style> </head> <body> <div class="play"></div> </body> </html>
原文：http://www.cnblogs.com/jzm17173/p/4409547.html