45个值得收藏的 CSS 形状

摘要：能够生成各种形状。正方形和矩形很容易，因为它们是的自然形状。添加宽度和高度，就得到了所需的精确大小的矩形。自从年双十一正式上线，累计处理了亿错误事件，付费客户有金山软件百姓网等众多品牌企业。

Fundebug经授权转载，版权归原作者所有。

CSS能够生成各种形状。正方形和矩形很容易，因为它们是 web 的自然形状。添加宽度和高度，就得到了所需的精确大小的矩形。添加边框半径，你就可以把这个形状变成圆形，足够多的边框半径，你就可以把这些矩形变成圆形和椭圆形。

我们还可以使用 CSS 伪元素中的 ::before 和 ::after，这为我们提供了向原始元素添加另外两个形状的可能性。通过巧妙地使用定位、转换和许多其他技巧，我们可以只用一个 HTML 元素在 CSS 中创建许多形状。

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。

#square {
 width: 100px;
 height: 100px;
 background: red;
}

#rectangle {
 width: 200px;
 height: 100px;
 background: red;
}

#circle {
 width: 100px;
 height: 100px;
 background: red;
 border-radius: 50%
}

#oval {
 width: 200px;
 height: 100px;
 background: red;
 border-radius: 100px / 50px;
}

#triangle-up {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-bottom: 100px solid red;
}

#triangle-down {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-top: 100px solid red;
}

#triangle-left {
 width: 0;
 height: 0;
 border-top: 50px solid transparent;
 border-right: 100px solid red;
 border-bottom: 50px solid transparent;
}

#triangle-right {
 width: 0;
 height: 0;
 border-top: 50px solid transparent;
 border-left: 100px solid red;
 border-bottom: 50px solid transparent;
}

#triangle-topleft {
 width: 0;
 height: 0;
 border-top: 100px solid red;
 border-right: 100px solid transparent;
}

#triangle-topright {
 width: 0;
 height: 0;
 border-top: 100px solid red;
 border-left: 100px solid transparent;
}

#triangle-bottomleft {
 width: 0;
 height: 0;
 border-bottom: 100px solid red;
 border-right: 100px solid transparent;
}

#triangle-bottomright {
 width: 0;
 height: 0;
 border-bottom: 100px solid red;
 border-left: 100px solid transparent;
}

#curvedarrow {
 position: relative;
 width: 0;
 height: 0;
 border-top: 9px solid transparent;
 border-right: 9px solid red;
 transform: rotate(10deg);
#curvedarrow:after {
 content: 
 position: absolute;
 border: 0 solid transparent;
 border-top: 3px solid red;
 border-radius: 20px 0 0 0;
 top: -12px;
 left: -9px;
 width: 12px;
 height: 12px;
 transform: rotate(45deg);
}

#trapezoid {
 border-bottom: 100px solid red;
 border-left: 25px solid transparent;
 border-right: 25px solid transparent;
 height: 0;
 width: 100px;
}

#parallelogram {
 width: 150px;
 height: 100px;
 transform: skew(20deg);
 background: red;
}

#star-six {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-bottom: 100px solid red;
 position: relative;
#star-six:after {
 width: 0;
 height: 0;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 border-top: 100px solid red;
 position: absolute;
 content: 
 top: 30px;
 left: -50px;
}

#star-five {
 margin: 50px 0;
 position: relative;
 display: block;
 color: red;
 width: 0px;
 height: 0px;
 border-right: 100px solid transparent;
 border-bottom: 70px solid red;
 border-left: 100px solid transparent;
 transform: rotate(35deg);
#star-five:before {
 border-bottom: 80px solid red;
 border-left: 30px solid transparent;
 border-right: 30px solid transparent;
 position: absolute;
 height: 0;
 width: 0;
 top: -45px;
 left: -65px;
 display: block;
 content: 
 transform: rotate(-35deg);
#star-five:after {
 position: absolute;
 display: block;
 color: red;
 top: 3px;
 left: -105px;
 width: 0px;
 height: 0px;
 border-right: 100px solid transparent;
 border-bottom: 70px solid red;
 border-left: 100px solid transparent;
 transform: rotate(-70deg);
 content: 

#pentagon {
 position: relative;
 width: 54px;
 box-sizing: content-box;
 border-width: 50px 18px 0;
 border-style: solid;
 border-color: red transparent;
#pentagon:before {
 content: 
 position: absolute;
 height: 0;
 width: 0;
 top: -85px;
 left: -18px;
 border-width: 0 45px 35px;
 border-style: solid;
 border-color: transparent transparent red;
}

#hexagon {
 width: 100px;
 height: 55px;
 background: red;
 position: relative;
#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 red;
#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 red;
}

#octagon {
 width: 100px;
 height: 100px;
 background: red;
 position: relative;
#octagon:before {
 content: 
 width: 100px;
 height: 0;
 position: absolute;
 top: 0;
 left: 0;
 border-bottom: 29px solid red;
 border-left: 29px solid #eee;
 border-right: 29px solid #eee;
#octagon:after {
 content: 
 width: 100px;
 height: 0;
 position: absolute;
 bottom: 0;
 left: 0;
 border-top: 29px solid red;
 border-left: 29px solid #eee;
 border-right: 29px solid #eee;

#heart {
 position: relative;
 width: 100px;
 height: 90px;
#heart:before,
#heart:after {
 position: absolute;
 content: 
 left: 50px;
 top: 0;
 width: 50px;
 height: 80px;
 background: red;
 border-radius: 50px 50px 0 0;
 transform: rotate(-45deg);
 transform-origin: 0 100%;
#heart:after {
 left: 0;
 transform: rotate(45deg);
 transform-origin: 100% 100%;

#infinity {
 position: relative;
 width: 212px;
 height: 100px;
 box-sizing: content-box;
#infinity:before,
#infinity:after {
 content: 
 box-sizing: content-box;
 position: absolute;
 top: 0;
 left: 0;
 width: 60px;
 height: 60px;
 border: 20px solid red;
 border-radius: 50px 50px 0 50px;
 transform: rotate(-45deg);
#infinity:after {
 left: auto;
 right: 0;
 border-radius: 50px 50px 50px 0;
 transform: rotate(45deg);

#diamond {
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-bottom-color: red;
 position: relative;
 top: -50px;
#diamond:after {
 content: 
 position: absolute;
 left: -50px;
 top: 50px;
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-top-color: red;

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#diamond-shield {
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-bottom: 20px solid red;
 position: relative;
 top: -50px;
#diamond-shield:after {
 content: 
 position: absolute;
 left: -50px;
 top: 20px;
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-top: 70px solid red;

#cut-diamond {
 border-style: solid;
 border-color: transparent transparent red transparent;
 border-width: 0 25px 25px 25px;
 height: 0;
 width: 50px;
 box-sizing: content-box;
 position: relative;
 margin: 20px 0 50px 0;
#cut-diamond:after {
 content: 
 position: absolute;
 top: 25px;
 left: -25px;
 width: 0;
 height: 0;
 border-style: solid;
 border-color: red transparent transparent transparent;
 border-width: 70px 50px 0 50px;
}

#diamond-narrow {
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-bottom: 70px solid red;
 position: relative;
 top: -50px;
#diamond-narrow:after {
 content: 
 position: absolute;
 left: -50px;
 top: 70px;
 width: 0;
 height: 0;
 border: 50px solid transparent;
 border-top: 70px solid red;

#egg {
 display: block;
 width: 126px;
 height: 180px;
 background-color: red;
 border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;

#pacman {
 width: 0px;
 height: 0px;
 border-right: 60px solid transparent;
 border-top: 60px solid red;
 border-left: 60px solid red;
 border-bottom: 60px solid red;
 border-top-left-radius: 60px;
 border-top-right-radius: 60px;
 border-bottom-left-radius: 60px;
 border-bottom-right-radius: 60px;

#talkbubble {
 width: 120px;
 height: 80px;
 background: red;
 position: relative;
 -moz-border-radius: 10px;
 -webkit-border-radius: 10px;
 border-radius: 10px;
#talkbubble:before {
 content: 
 position: absolute;
 right: 100%;
 top: 26px;
 width: 0;
 height: 0;
 border-top: 13px solid transparent;
 border-right: 26px solid red;
 border-bottom: 13px solid transparent;

#burst-12 {
 background: red;
 width: 80px;
 height: 80px;
 position: relative;
 text-align: center;
#burst-12:before,
#burst-12:after {
 content: 
 position: absolute;
 top: 0;
 left: 0;
 height: 80px;
 width: 80px;
 background: red;
#burst-12:before {
 transform: rotate(30deg);
#burst-12:after {
 transform: rotate(60deg);

#burst-8 {
 background: red;
 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: red;
 transform: rotate(135deg);

#yin-yang {
 width: 96px;
 box-sizing: content-box;
 height: 48px;
 background: #eee;
 border-color: red;
 border-style: solid;
 border-width: 2px 2px 50px 2px;
 border-radius: 100%;
 position: relative;
#yin-yang:before {
 content: 
 position: absolute;
 top: 50%;
 left: 0;
 background: #eee;
 border: 18px solid red;
 border-radius: 100%;
 width: 12px;
 height: 12px;
 box-sizing: content-box;
#yin-yang:after {
 content: 
 position: absolute;
 top: 50%;
 left: 50%;
 background: red;
 border: 18px solid #eee;
 border-radius: 100%;
 width: 12px;
 height: 12px;
 box-sizing: content-box;

#badge-ribbon {
 position: relative;
 background: red;
 height: 100px;
 width: 100px;
 border-radius: 50px;
#badge-ribbon:before,
#badge-ribbon:after {
 content: 
 position: absolute;
 border-bottom: 70px solid red;
 border-left: 40px solid transparent;
 border-right: 40px solid transparent;
 top: 70px;
 left: -10px;
 transform: rotate(-140deg);
#badge-ribbon:after {
 left: auto;
 right: -10px;
 transform: rotate(140deg);

#space-invader {
 box-shadow: 0 0 0 1em red,
 0 1em 0 1em red,
 -2.5em 1.5em 0 .5em red,
 2.5em 1.5em 0 .5em red,
 -3em -3em 0 0 red,
 3em -3em 0 0 red,
 -2em -2em 0 0 red,
 2em -2em 0 0 red,
 -3em -1em 0 0 red,
 -2em -1em 0 0 red,
 2em -1em 0 0 red,
 3em -1em 0 0 red,
 -4em 0 0 0 red,
 -3em 0 0 0 red,
 3em 0 0 0 red,
 4em 0 0 0 red,
 -5em 1em 0 0 red,
 -4em 1em 0 0 red,
 4em 1em 0 0 red,
 5em 1em 0 0 red,
 -5em 2em 0 0 red,
 5em 2em 0 0 red,
 -5em 3em 0 0 red,
 -3em 3em 0 0 red,
 3em 3em 0 0 red,
 5em 3em 0 0 red,
 -2em 4em 0 0 red,
 -1em 4em 0 0 red,
 1em 4em 0 0 red,
 2em 4em 0 0 red;
 background: red;
 width: 1em;
 height: 1em;
 overflow: hidden;
 margin: 50px 0 70px 65px;

#tv {
 position: relative;
 width: 200px;
 height: 150px;
 margin: 20px 0;
 background: red;
 border-radius: 50% / 10%;
 color: white;
 text-align: center;
 text-indent: .1em;
#tv:before {
 content: 
 position: absolute;
 top: 10%;
 bottom: 10%;
 right: -5%;
 left: -5%;
 background: inherit;
 border-radius: 5% / 50%;

#chevron {
 position: relative;
 text-align: center;
 padding: 12px;
 margin-bottom: 6px;
 height: 60px;
 width: 200px;
#chevron:before {
 content: 
 position: absolute;
 top: 0;
 left: 0;
 height: 100%;
 width: 51%;
 background: red;
 transform: skew(0deg, 6deg);
#chevron:after {
 content: 
 position: absolute;
 top: 0;
 right: 0;
 height: 100%;
 width: 50%;
 background: red;
 transform: skew(0deg, -6deg);

#magnifying-glass {
 font-size: 10em;
 display: inline-block;
 width: 0.4em;
 box-sizing: content-box;
 height: 0.4em;
 border: 0.1em solid red;
 position: relative;
 border-radius: 0.35em;
#magnifying-glass:before {
 content: 
 display: inline-block;
 position: absolute;
 right: -0.25em;
 bottom: -0.1em;
 border-width: 0;
 background: red;
 width: 0.35em;
 height: 0.08em;
 transform: rotate(45deg);
}

#facebook-icon {
 background: red;
 text-indent: -999em;
 width: 100px;
 height: 110px;
 box-sizing: content-box;
 border-radius: 5px;
 position: relative;
 overflow: hidden;
 border: 15px solid red;
 border-bottom: 0;
#facebook-icon:before {
 content: /20 
 position: absolute;
 background: red;
 width: 40px;
 height: 90px;
 bottom: -30px;
 right: -37px;
 border: 20px solid #eee;
 border-radius: 25px;
 box-sizing: content-box;
#facebook-icon:after {
 content: /20 
 position: absolute;
 width: 55px;
 top: 50px;
 height: 20px;
 background: #eee;
 right: 5px;
 box-sizing: content-box;
}

#moon {
 width: 80px;
 height: 80px;
 border-radius: 50%;
 box-shadow: 15px 15px 0 0 red;

#flag {
 width: 110px;
 height: 56px;
 box-sizing: content-box;
 padding-top: 15px;
 position: relative;
 background: red;
 color: white;
 font-size: 11px;
 letter-spacing: 0.2em;
 text-align: center;
 text-transform: uppercase;
#flag:after {
 content: 
 position: absolute;
 left: 0;
 bottom: 0;
 width: 0;
 height: 0;
 border-bottom: 13px solid #eee;
 border-left: 55px solid transparent;
 border-right: 55px solid transparent;

 #cone {
 width: 0;
 height: 0;
 border-left: 70px solid transparent;
 border-right: 70px solid transparent;
 border-top: 100px solid red;
 border-radius: 50%;

#cross {
 background: red;
 height: 100px;
 position: relative;
 width: 20px;
#cross:after {
 background: red;
 content: 
 height: 20px;
 left: -40px;
 position: absolute;
 top: 40px;
 width: 100px;
}

 #base {
 background: red;
 display: inline-block;
 height: 55px;
 margin-left: 20px;
 margin-top: 55px;
 position: relative;
 width: 100px;
#base:before {
 border-bottom: 35px solid red;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
 content: 
 height: 0;
 left: 0;
 position: absolute;
 top: -35px;
 width: 0;
}

#pointer {
 width: 200px;
 height: 40px;
 position: relative;
 background: red;
#pointer:after {
 content: 
 position: absolute;
 left: 0;
 bottom: 0;
 width: 0;
 height: 0;
 border-left: 20px solid white;
 border-top: 20px solid transparent;
 border-bottom: 20px solid transparent;
#pointer:before {
 content: 
 position: absolute;
 right: -20px;
 bottom: 0;
 width: 0;
 height: 0;
 border-left: 20px solid red;
 border-top: 20px solid transparent;
 border-bottom: 20px solid transparent;

#lock {
 font-size: 8px;
 position: relative;
 width: 18em;
 height: 13em;
 border-radius: 2em;
 top: 10em;
 box-sizing: border-box;
 border: 3.5em solid red;
 border-right-width: 7.5em;
 border-left-width: 7.5em;
 margin: 0 0 6rem 0;
#lock:before {
 content: 
 box-sizing: border-box;
 position: absolute;
 border: 2.5em solid red;
 width: 14em;
 height: 12em;
 left: 50%;
 margin-left: -7em;
 top: -12em;
 border-top-left-radius: 7em;
 border-top-right-radius: 7em;
#lock:after {
 content: 
 box-sizing: border-box;
 position: absolute;
 border: 1em solid red;
 width: 5em;
 height: 8em;
 border-radius: 2.5em;
 left: 50%;
 top: -1em;
 margin-left: -2.5em;
}

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