???????div{ ???????????width: 200px; ???????????height: 200px; ???????????border: #f00 solid 1px; ???????????margin-bottom: 10px; ???????}1、设置 border-radius: 20px;
???????div:first-of-type{ ???????????border-radius: 20px; ???????}css3圆角矩形
原文地址：https://www.cnblogs.com/qingyang-0-0/p/9395171.html