效果展示：
代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
/* 圆形*/
#css3-circle{
width: 150px;
height: 150px;
border-radius: 50%;
background-color: #232323;}
/* 椭圆形 */
#css3-elipse{
width: 200px;
height: 100px;
border-radius: 50%;
background-color: #232323;}
/* 三角形*/
#css3-triangle{
width: 0;
height: 0;
border-left: 100px solid transparent;
border-right: 100px solid transparent;
border-bottom: 150px solid #232323;}
/* 平行四边形 */
#css3-parallelogram{
width: 200px;
height: 100px;
background: #232323;
-webkit-transform: skew(-45deg); -moz-transform: skew(-45deg); -o-transform: skew(-45deg);
transform: skew(-45deg);
}
/* 梯形 */
#css3-trapezoid{
width: 100px;
height: 0;
border-bottom: 100px solid #232323;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}
/* 六角星 */
#css3-six-star{
width: 0;
height: 0;
position: relative;
border-bottom: 100px solid #232323;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}
#css3-six-star:after{
content: "";
width: 0;
height: 0;
position: absolute;
left: -50px;
top: 35px;
border-top: 100px solid #232323;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}
/* 五角星 */
#css3-five-star{
width: 0px;
height: 0px;
margin: 50px 0;
position: relative;
display: block;
color: #232323;
border-right: 100px solid transparent;
border-bottom: 70px solid #232323;
border-left:100px solid transparent; -moz-transform:rotate(35deg); -webkit-transform: rotate(35deg); -ms-transform:rotate(35deg); -o-transform:rotate(35deg);
}#css3-five-star:before{
border-bottom: 80px solid #232323;;
border-left: 30px solid transparent;
border-right: 30px solid transparent;
position: absolute;
height: 0;
width: 0;
top: -45px;
left: -63px;
display: block;
content: ''; -webkit-transform: rotate(-35deg); -moz-transform:rotate(-35deg); -ms-transform:rotate(-35deg); -o-transform:rotate(-35deg);
}#css3-five-star:after{
position: absolute;
display: block;
color: #232323;
top: 3px;
left: -105px;
width: 0px;
height: 0px;
border-right: 100px solid transparent;
border-bottom: 70px solid #232323;
border-left: 100px solid transparent; -webkit-transform: rotate(-70deg); -moz-transform:rotate(-70deg); -ms-transform:rotate(-70deg); -o-transform:rotate(-70deg);
content: '';
}
/* 八卦 */
#css3-gossip {
width: 96px;
height: 48px;
background: #f1f1f1;
border-color: #232323;
border-style: solid;
border-width: 2px 2px 50px 2px;
border-radius: 100%;
position: relative;
}
#css3-gossip:before{
content: "";
position: absolute;
top: 50%;
left: 0;
background: #f1f1f1;
border: 18px solid #232323;
border-radius: 100%;
width: 12px;
height: 12px;
}#css3-gossip:after {
content: "";
position: absolute;
top: 50%;
left: 50%;
background: #232323;
border: 18px solid #f1f1f1;
border-radius:100%;
width: 12px;
height: 12px;
}
</style>
</head>
<body>
<div id="css3-circle">圆形</div>
<div id="css3-elipse">椭圆形</div>
<div id="css3-trapezoid">梯形</div>
<div id="css3-elipse">三角形</div>
<div id="css3-parallelogram">平行四边形</div>
<div id="css3-five-star">五角星</div>
<div id="css3-six-star">六角星</div>
<div id="css3-gossip">八卦</div>
</body>
</html>
