HTML-border-radius-画圆或椭圆

<!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>
原文地址:https://www.cnblogs.com/turnip/p/11310344.html