<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>倒圆角</title> <style type="text/css"> .one{ height: 100px; width: 50px; border: 1px solid gainsboro; /*border-radius: 50px 20px 10px 0px;*//*值为 *px *%倒圆角*/ /*border-radius: 50px;*/ border-radius: 50px; /*border-radius:50%;*/ } .two{ height: 200px; width: 200px; background: yellow; border-radius: 100px 0px; } .three{ height: 200px; width: 200px; background: yellow; border-radius: 200px 0px; } .four{ /*月牙弯弯*/ height: 200px; width: 200px; /*background: red;*/ box-shadow: 20px 20px 0px yellow inset; border-radius: 50%; } </style> </head> <body> <div class="one"></div> <div class="two"></div> <div class="three"></div> <div class="four"></div> </body> </html>