虽然我们现在大都使用字体图标或者svg图片，似乎使用 CSS 来做图标意义不是很大，但怎么实现这些图标用到的一些技巧及思路是很值得我们的学习。
一、实心圆
.circle { width: 120px; height: 120px; background: #8BC34A; border-radius: 100%;}二、圆环（空心圆）
.ring { width: 100px; height: 100px; border: 10px solid #8BC34A; border-radius: 100%;}三、椭圆
.ellipsis { width: 200px; height: 120px; background: #8BC34A; border-radius: 100px/60px;}四、半圆
.top-semicircle { width: 120px; height: 60px; background: #8BC34A; border-radius: 60px 60px 0px 0px;}.right-semicircle { width: 60px; height: 120px; background: #8BC34A; border-radius: 0 60px 60px 0;}.bottom-semicircle { width: 120px; height: 60px; background: #8BC34A; border-radius: 0 0 60px 60px;}.left-semicircle { width: 60px; height: 120px; background: #8BC34A; border-radius: 60px 0 0 60px;}五、四分之一圆（扇形）
.toplf-sector,.toprt-sector,.bottomlf-sector,.bottomrt-sector { width: 60px; height: 60px; background: #8BC34A;}.toplf-sector { border-radius: 60px 0 0 0;}.toprt-sector { border-radius: 0 60px 0 0;}.bottomlf-sector { border-radius: 0 0 0 60px;}.bottomrt-sector { border-radius: 0 0 60px 0;}六、心形
.heart-shaped { width: 80px; height: 80px; background: #8BC34A; position: relative; transform: rotate(45deg);}.heart-shaped::before { content: ""; width: 40px; height: 80px; background: #8BC34A; border-radius: 40px 0 0 40px; position: absolute; right: 99%; top: 0;}.heart-shaped::after { content: ""; width: 80px; height: 40px; background: #8BC34A; border-radius: 40px 40px 0 0; position: absolute; left: 0; bottom: 99%;}七、鸡蛋
.egg { width: 150px; height: 200px; background: #8BC34A; border-radius: 75px 75px 75px 75px / 130px 130px 70px 70px;}八、太极八卦阵图
.taiji { width: 140px; height: 70px; border: 2px solid #8BC34A; border-bottom: 70px solid #8BC34A; border-radius: 100%; position: relative;}.taiji::before { content: ""; position: absolute; left: 0; top: 50%; width: 20px; height: 20px; background: #fff; border: 25px solid #8BC34A; border-radius: 100%;}.taiji::after { content: ""; position: absolute; right: 0; top: 50%; width: 20px; height: 20px; background: #8BC34A; border: 25px solid #fff; border-radius: 100%;}九、叶子（花瓣）
.leaf1 { width: 80px; height: 80px; background: #8BC34A; border-radius: 0 80px;}.leaf2 { width: 80px; height: 80px; background: #8BC34A; border-radius: 40px 40px 0 40px;}十、五叶花瓣
.five-flower { position: relative; width: 300px; height: 280px;}.five-flower .petal { display: block; width: 120px; height: 120px; background: #8BC34A; border-radius: 0 120px; position: absolute; transform-origin: 100% 100%;}.five-flower .petal1 { transform: rotate(72deg);}.five-flower .petal2 { transform: rotate(144deg);}.five-flower .petal3 { transform: rotate(216deg);}.five-flower .petal4 { transform: rotate(288deg);}十一、牵牛花
.qiannuhua { position: relative; width: 200px; height: 200px; margin-left: 140px;}.qiannuhua .petal { display: block; width: 120px; height: 120px; background: #8BC34A; border-radius: 0 120px; position: absolute; transform-origin: 0% 100%}.qiannuhua .petal1 { transform: rotate(72deg);}.qiannuhua .petal2 { transform: rotate(144deg);}.qiannuhua .petal3 { transform: rotate(216deg);}.qiannuhua .petal4 { transform: rotate(288deg);}十二、风车
.fengche { position: relative; width: 200px; height: 200px;}.fengche .petal { display: block; width: 120px; height: 120px; background: #8BC34A; border-radius: 0 120px; position: absolute; transform-origin: 30% 100%}.fengche .petal1 { transform: rotate(72deg);}.fengche .petal2 { transform: rotate(144deg);}.fengche .petal3 { transform: rotate(216deg);}.fengche .petal4 { transform: rotate(288deg);}十四、小尾巴
.xwb1 { width: 20px; height: 30px; border-left: 8px solid #8BC34A; border-radius: 30px 0 0 0;}十五、箭头
.xwb2 { width: 0; height: 0; border-bottom: 10px solid #8BC34A; border-left: 10px solid transparent; position: relative; transform: rotate(8deg);}.xwb2::after { content: ""; width: 20px; height: 18px; border-right: 5px solid #8BC34A; border-radius: 0px 40px 0 0; position: absolute; left: -30px; bottom: -15px; transform: rotate(-45deg);}十六、月亮
.moon { width: 80px; height: 120px; border-left: 40px solid #8BC34A; border-radius: 60px;}十六、三角形
.triangle-bot { width: 0; height: 0; border: 40px solid transparent; border-bottom-color: #8BC34A;}.triangle-top { width: 0; height: 0; border: 40px solid transparent; border-top-color: #8BC34A;}.triangle-lf { width: 0; height: 0; border: 40px solid transparent; border-left-color: #8BC34A;}.triangle-rt { width: 0; height: 0; border: 40px solid transparent; border-right-color: #8BC34A;}.triangle-toplf,.triangle-toprt,.triangle-bottomlf,.triangle-bottomrt { width: 0; height: 0;}.triangle-toplf { border-top: 120px solid #8BC34A; border-right: 120px solid transparent;}.triangle-toprt { border-top: 120px solid #8BC34A; border-left: 120px solid transparent;}.triangle-bottomlf { border-bottom: 120px solid #8BC34A; border-right: 120px solid transparent;}.triangle-bottomrt { border-bottom: 120px solid #8BC34A; border-left: 120px solid transparent;}.triangle1 { border-bottom: 120px solid #8BC34A; border-right: 60px solid transparent;}.triangle2 { border-top: 120px solid #8BC34A; border-left: 60px solid transparent;}.triangle3 { border-top: 60px solid #8BC34A; border-right: 120px solid transparent;}.triangle4 { border-top: 60px solid #8BC34A; border-left: 120px solid transparent;}.triangle5 { border-top: 80px solid #8BC34A; border-left: 40px solid transparent; border-right: 40px solid transparent;}十七、梯形
.tixing1 { border-bottom: 100px solid #8BC34A; border-left: 60px solid transparent; border-right: 60px solid transparent; width: 100px; height: 0;}.tixing2 { border-bottom: 120px solid #8BC34A; border-right: 120px solid transparent; width: 80px;}十八、边框对话框
.duihuakuang { width: 200px; height: 100px; border: 2px solid #8BC34A; border-radius: 6px; position: relative;}.duihuakuang::before { content: ""; width: 20px; height: 20px; background: #fff; border-right: 2px solid #8BC34A; border-bottom: 2px solid #8BC34A; position: absolute; left: 30%; top: 100%; transform: rotate(45deg); margin-top: -10px;}十九、锁
.suo { width: 200px; height: 160px; background: #8BC34A; border-radius: 30px; position: relative;}/*锁孔*/.suo::before { content: ""; width: 25px; height: 50px; background: #fff; position: absolute; left: 50%; top: 50%; border-radius: 25px; transform: translate(-50%, -50%);}/*锁把*/.suo::after { content: ""; width: 80px; height: 70px; border: 20px solid #8BC34A; background: #fff; border-radius: 60px 60px 0 0; position: absolute; left: 50%; bottom: 89%; transform: translateX(-50%);}二十、立体球型
.qiu1 { width: 120px; height: 120px; background: #8BC34A; background-image: radial-gradient(at 20% 30%, #e5ffc7, #75af33, #375f0a); border-radius: 100%;}二十一、圆柱
<div class="cylinder fl"> <div class="ellipse"></div> <div class="rectangle"></div></div>.cylinder { position: relative; transform: rotateX(70deg);}.ellipse { width: 100px; height: 100px; background: deepskyblue; border-radius: 50px;}.rectangle { width: 100px; height: 400px; position: absolute; opacity: 0.6; background: deepskyblue; top: 0; left: 0; border-radius: 50px; z-index: -1;}更多形状图形持续更新，欢迎大家讨论提出问题
（CSS渐变绘制切角效果）
参考文章：
http://www.imooc.com/article/...