<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style> body{ background: #ccc; } #box{ width: 0px; height: 600px; border-left: 300px solid white; border-right: 300px solid black; border-radius: 600px; } #box::before{ content: ‘‘; display: block; width: 100px; height: 100px; border: 100px solid white; background: black; border-radius: 100%; margin-left: -150px; } #box::after{ content: ‘‘; display: block; width: 100px; height: 100px; border: 100px solid black; background: white; border-radius: 100%; margin-left: -150px; } </style> </head> <body> <div id="box"></div> </body> </html>
原文：https://www.cnblogs.com/gxywb/p/10875996.html