CSS实现心形、六角星、六边形、平行四边形等几何

本文将利用border属性实现简单几何的绘制；

效果图：

正八角星
说明:采用两个正方形以中心进行旋转叠加；

/* 八角星 */
    #burst-8 {
        background: #6376ff1f;
        width: 80px;
        height: 80px;
        position: relative;
        text-align: center;
        transform: rotate(20deg);
    }

    #burst-8:before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        height: 80px;
        width: 80px;
        background: #6376ff1f;
        transform: rotate(135deg);
    }

正六边形
说明：将长方形，与两个三角形拼接；

 /* 正六边形 */
    #hexagon {
        width: 100px;
        height: 55px;
        background: #6376ff1f;
        position: relative;
        top: 25px;
    }

    #hexagon:before {
        content: "";
        position: absolute;
        top: -25px;
        left: 0;
        width: 0;
        height: 0;
        border-left: 50px solid transparent;
        border-right: 50px solid transparent;
        border-bottom: 25px solid #6376ff1f;
    }

    #hexagon:after {
        content: "";
        position: absolute;
        bottom: -25px;
        left: 0;
        width: 0;
        height: 0;
        border-left: 50px solid transparent;
        border-right: 50px solid transparent;
        border-top: 25px solid #6376ff1f;
    }

平行四边形
说明:采用矩形skew倾斜的方式；

#ping {
        height: 50px;
        width: 100px;
        transform: skew(20deg);
        background: #6376ff1f;
    }

椭圆
说明:采用矩形border-radius的方式；

#tuoyuan {
        height: 50px;
        width: 100px;
        border-radius: 50%;
        background: #6376ff1f;
    }

心形
说明：将正方形旋转45度，与两个直径和其半径相同的半圆进行旋转、平移、拼接；

/* 心形 */
    #heart {
        height: 50px;
        width: 50px;
        background: #6376ff1f;
        transform: rotate(45deg);
    }

    #heart:before {
        position: absolute;
        content: "";
        left: -25px;
        top: 0px;
        width: 50px;
        height: 25px;
        transform: rotate(-90deg);
        background: #6376ff1f;
        transform-origin: bottom;
        border-radius: 50px 50px 0 0;
    }

    #heart:after {
        position: absolute;
        content: "";
        left: 0px;
        top: -25px;
        width: 50px;
        height: 25px;
        background: #6376ff1f;
        border-radius: 50px 50px 0 0;
    }

六角星
说明:采用两个等腰三角形进行叠加；

/* 六角星 */
    #star-six {
        width: 0;
        height: 0;
        border-left: 50px solid transparent;
        border-right: 50px solid transparent;
        border-bottom: 100px solid #6376ff1f;
        position: relative;
    }
    #star-six:after {
        width: 0;
        height: 0;
        border-left: 50px solid transparent;
        border-right: 50px solid transparent;
        border-top: 100px solid #6376ff1f;
        position: absolute;
        content: "";
        top: 30px;
        left: -50px;
    }

原文地址：https://www.cnblogs.com/giserjobs/p/12018372.html