<!doctype html><html lang="en"> <head> ?<meta charset="UTF-8"> ?<title>Document</title> ???<style> ???????#d1{ ???????????width:200px; ???????????height:200px; ???????????border:2px solid #000; ???????????border-radius:50%; ???????????box-shadow:0px 0px 20px red; ???????} ???</style> </head> <body> ?<div id="d1"></div> </body></html>HTML-border-radius-画圆或椭圆
原文地址：https://www.cnblogs.com/-hjj/p/9943053.html