CSS3 画基本图形，圆形、椭圆形、三角形等

CSS3 圆形
#css3-circle{
 width: 150px;
 height: 150px;
 border-radius: 50%;
 background-color: #232323;}
CSS3 椭圆形
#css3-elipse{
 width: 200px;
 height: 100px;
 border-radius: 50%;
 background-color: #232323;}
CSS3 三角形
#css3-triangle{
 width: 0;
 height: 0;
 border-left: 100px solid transparent;
 border-right: 100px solid transparent;
 border-bottom: 150px solid #232323;}
CSS3 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);
}
CSS3 梯形
#css3-trapezoid{
 width: 100px;
 height: 0;
 border-bottom: 100px solid #232323;
 border-left: 50px solid transparent;
 border-right: 50px solid transparent;
}
CSS3 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;
}
CSS3 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);