<!DOCTYPE html>
<html lang="en">
<head>
??<meta charset="UTF-8">
??<title>模板</title>
??<style>
?????body, ul, li, dl, dt, dd, h1, h2, h3, h4, h5 {
????????margin: 0;
????????padding: 0;
?????}
?????body {
????????font-weight:bold;">#F7F7F7;
?????}
?????.wrapper {
????????width: 1000px;
????????margin: 0 auto;
????????padding: 20px;
????????box-sizing: border-box;
?????}
?????header {
????????padding: 20px 0;
????????margin-bottom: 20px;
????????text-align: center;
?????}
?????header h3 {
????????line-height: 1;
????????font-weight: normal;
????????font-size: 28px;
?????}
?????.main {
????????/*overflow: hidden;*/
?????}
?????.main:after {
????????content: ‘‘;
????????clear: both;
????????display: block;
?????}
?????.main .item {
????????width: 210px;
????????height: 210px;
????????margin: 0 30px 30px 0;
????????display: flex;
????????position: relative;
????????font-weight:bold;">#FFF;
????????float: left;
????????box-shadow: 2px 2px 5px #CCC;
?????}
?????
?????.main .item:after {
????????content: attr(data-brief);
????????display: block;
????????width: 100%;
????????height: 100%;
????????text-align: center;
????????line-height: 210px;
????????position: absolute;
????????top: 0;
????????left: 0;
????????color: #FFF;
????????font-family: ‘微软雅黑‘;
????????font-size: 18px;
????????font-weight:bold;">rgba(170, 170, 170, 0);
????????z-index: -1;
????????transition: all 0.3s ease-in;
?????}
?????.main .item:hover:after {
????????font-weight:bold;">rgba(170, 170, 170, 0.6);
????????z-index: 100;
?????}
?????.main .item:nth-child(4n) {
????????margin-right: 0;
?????}
?????/*.main .item:nth-last-child(-n+5) {
????????margin-bottom: 0;
?????}*/
?????/* 以上是骨架样式 */
??????.border-radius {
????????width: 180px;
????????height: 180px;
????????border: 1px solid #ff4da5;
????????margin: auto;
?????}
?????/* 整圆 */
?????.item:nth-child(1) .border-radius {
????????border-radius: 90px;
?????}
?????/* 拱形 */
?????.item:nth-child(2) .border-radius {
????????border-radius: 90px 90px 0 0;
?????}
?????/* 半圆 */
?????.item:nth-child(3) .border-radius {
????????height: 90px;
????????border-radius: 90px 90px 0 0;
?????}
?????/* 左上角 */
?????.item:nth-child(4) .border-radius {
????????border-radius: 90px 0 0 0;
?????}
?????/* 四分之一圆 */
?????.item:nth-child(5) .border-radius {
????????width: 90px;
????????height: 90px;
????????border-radius: 90px 0 0 0;
?????}
?????/* 横着的椭圆 */
?????.item:nth-child(6) .border-radius {
????????height: 90px;
????????border-radius: 90px / 45px;
?????}
?????/* 竖着的椭圆 */
?????.item:nth-child(7) .border-radius {
????????width: 90px;
????????border-radius: 45px / 90px;
?????}
?????/* 横着的半椭圆 */
?????.item:nth-child(8) .border-radius {
????????height: 45px;
????????border-radius: 90px 90px 0 0 / 45px 45px 0 0;
?????}
?????/* 竖着的半椭圆 */
?????.item:nth-child(9) .border-radius {
????????width: 45px;
????????border-radius: 45px 0 0 45px / 90px 0 0 90px;
?????}
?????/* 四分之一竖着的半椭圆 */
?????.item:nth-child(10) .border-radius {
????????width: 45px;
????????height: 90px;
????????border-radius: 45px 0 0 0 / 90px 0 0 0;
?????}
?????/* 饼环 */
?????.item:nth-child(11) .border-radius {
????????width: 70px;
????????height: 70px;
????????border-width: 55px;
????????border-radius: 90px;
?????}
?????/* 圆饼 */
?????.item:nth-child(12) .border-radius {
????????width: 70px;
????????height: 70px;
????????border-width: 55px;
????????border-radius: 45px;
?????}
?????/* 左上角圆饼 */
?????.item:nth-child(13) .border-radius {
????????width: 70px;
????????height: 70px;
????????border-width: 55px;
????????border-radius: 90px 0 0 0;
?????}
?????/* 对角圆饼 */
?????.item:nth-child(14) .border-radius {
????????width: 70px;
????????height: 70px;
????????border-width: 55px;
????????border-radius: 90px 0 90px 0;
?????}
?????/* 四边不同色 */
?????.item:nth-child(15) .border-radius {
????????width: 0;
????????height: 0;
????????border-width: 90px;
????????border-color: red blueviolet greenyellow paleturquoise;
?????}
?????/* 右边透明色 */
?????.item:nth-child(16) .border-radius {
????????width: 0;
????????height: 0;
????????border-width: 90px;
????????border-color: red blueviolet greenyellow paleturquoise;
????????border-right-color: transparent;
?????}
?????/* 圆右透明色 */
?????.item:nth-child(17) .border-radius {
????????width: 0;
????????height: 0;
????????border-width: 90px;
????????border-color: red blueviolet greenyellow paleturquoise;
????????border-right-color: transparent;
????????border-radius: 90px;
?????}
?????/* 圆右有色其他透明色 */
?????.item:nth-child(18) .border-radius {
????????width: 0;
????????height: 0;
????????border-width: 90px;
????????border-color: transparent;
????????border-right-color: blueviolet;
????????border-radius: 90px;
?????}
?????/* 阴阳图前世 */
?????.item:nth-child(19) .border-radius {
????????width: 180px;
????????height: 0;
????????border-top-width: 90px;
????????border-bottom-width: 90px;
????????border-top-color: blueviolet;
????????border-bottom-color: yellow;
????????border-radius: 90px;
?????}
?????/* 阴阳图今生 */
?????.item:nth-child(20) .border-radius {
????????width: 180px;
????????height: 90px;
????????border-bottom-width: 90px;
????????border-bottom-color: yellow;
????????font-weight:bold;">blueviolet;
????????border-radius: 90px;
????????position: relative;
?????}
?????.item:nth-child(20) .border-radius::after,
?????.item:nth-child(20) .border-radius::before {
????????content: ‘‘;
????????position: absolute;
????????top: 50%;
????????width: 20px;
????????height: 20px;
????????/*margin: -10px 0 0 0;*/
????????border-width: 35px;
????????border-style: solid;
????????/*border-radius: 45px;*/
????????border-radius: 45px;
?????}
?????/*左阴阳*/
?????.item:nth-child(20) .border-radius::after {
????????font-weight:bold;">blueviolet;
????????border-color: yellow;
?????}
?????/*右阴阳*/
?????.item:nth-child(20) .border-radius::before {
????????font-weight:bold;">yellow;
????????border-color: blueviolet;
????????right: 0;
?????}
?????
?????/* 消息框 */
?????.item:nth-child(21) .border-radius {
????????width: 160px;
????????height: 60px;
????????border-color: greenyellow;
????????font-weight:bold;">greenyellow;
????????border-radius: 10px;
????????position: relative;
?????}
?????.item:nth-child(21) .border-radius::before {
????????content: ‘‘;
????????width: 0px;
????????height: 0px;
????????border-width: 10px;
????????border-style: solid;
????????border-color: transparent;
????????border-right-color: greenyellow;
????????top: 10px;
????????left: -20px;
????????position: absolute;
?????}
?????/* 奇怪的图形 */
?????.item:nth-child(22) .border-radius {
????????width: 40px;
????????height: 40px;
????????border-width: 40px 0 40px 60px;
????????border-style: solid;
????????border-color: aquamarine;
????????border-radius: 0 0 75px 0;
?????}
?????/* qq消息框 */
?????.item:nth-child(23) .border-radius {
????????width: 160px;
????????height: 60px;
????????border-color: greenyellow;
????????font-weight:bold;">greenyellow;
????????border-radius: 10px;
????????position: relative;
?????}
?????.item:nth-child(23) .border-radius::after {
????????content: ‘‘;
????????width: 30px;
????????height: 30px;
????????border-width: 0 0 30px 30px;
????????border-style: solid;
????????border-color: transparent;
????????border-bottom-color: greenyellow;
????????border-radius: 0 0 75px 0;
????????position: absolute;
????????top: -10px;
????????right: -20px;
?????}
??</style>
</head>
<body>
??<div class="wrapper">
?????<header>
????????<h3>模板</h3>
?????</header>
?????<div class="main">
????????<div class="item" data-brief="整圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="拱形">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="半圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="左上角">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="四分之一圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="横着的椭圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="竖着的椭圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="横着的半椭圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="竖着的半椭圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="四分之一竖着的椭圆">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="饼环">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="圆饼">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="左上角圆饼">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="对角圆饼">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="四边不同色">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="右边透明色">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="圆右边透明色">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="圆右边有色其他透明色">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="阴阳图前世">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="阴阳图今生">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="消息框">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="奇怪的图形">
???????????<div class="border-radius"></div>
????????</div>
????????<div class="item" data-brief="qq消息框">
???????????<div class="border-radius"></div>
????????</div>
?????</div>
??</div>
</body>
</html>
CSS3之边框圆角的设置案例
原文地址：https://www.cnblogs.com/zlinger/p/9515110.html