使用css3的border-radius和border制作半圆、三角、椭圆等各种图形

自从有了css3,我们可以制作各种各样的图形了，制作圆角也可以不使用图片了，我们可以使用border-radius可以制作圆角，椭圆等图形。下面我们来看一下如何制作这些的（以下例子请在现代高级浏览器浏览）。

css代码：

.content-wrap {
	height:auto;
	overflow:hidden;
}
.content-wrap h3 {
	height:30px;
	margin-top:40px;
}
.content-wrap ul {
	width:100%;
	height:auto;
	overflow:hidden;
}
.content-wrap ul li {
	float:left;
	text-align:center;
	margin:30px 100px 0 0;
	list-style:none;
	color:#fff;
	line-height:50px;
	padding:0
}
/*整圆*/
	.content-wrap .circle {
	width:100px;
	height:100px;
	border-radius:50px;
	background:#306;
	color:#fff;
	text-align:center;
	line-height:50px;
}
/*semi-circle半圆制作*/
	.content-wrap .semi-circle li {
	background:#000;
	font-size:14px;
}
.content-wrap .semi-circle li:nth-child(1) {
	width:50px;
	height:100px;
	border-radius:50px 0 0 50px
}
.content-wrap .semi-circle li:nth-child(2) {
	width:100px;
	height:50px;
	border-radius:50px 50px 0 0
}
.content-wrap .semi-circle li:nth-child(3) {
	width:50px;
	height:100px;
	border-radius:0 50px 50px 0
}
.content-wrap .semi-circle li:nth-child(4) {
	width:100px;
	height:50px;
	border-radius:0 0 50px 50px
}
/*oval-shaped椭圆制作*/
	.content-wrap .oval-shaped li {
	background:#300
}
.content-wrap .oval-shaped li:nth-child(1) {
	width:100px;
	height:50px;
	border-radius:50px / 25px;
}
.content-wrap .oval-shaped li:nth-child(2) {
	width:50px;
	height:100px;
	border-radius:25px / 50px;
}
/*triangle三角形制作*/
	.content-wrap .triangle li {
	width:0;
	height:0;
	font-size:0;
	line-height:0;
}
.content-wrap .triangle li:nth-child(1) {
	border-left:20px solid transparent;
	border-right:20px solid transparent;
	border-bottom:20px solid #006;
}
.content-wrap .triangle li:nth-child(2) {
	border-left:20px solid transparent;
	border-right:20px solid transparent;
	border-top:20px solid #006;
}
.content-wrap .triangle li:nth-child(3) {
	border-top:20px solid transparent;
	border-bottom:20px solid transparent;
	border-right:20px solid #006;
}
.content-wrap .triangle li:nth-child(4) {
	border-top:20px solid transparent;
	border-bottom:20px solid transparent;
	border-left:20px solid #006;
}
/**标签图形**/
	#tag-shapes li {
	padding: 0 20px;
	height: 40px;
	line-height: 40px;
	text-align: center;
	background: #2AADA2;
	color: #fff;
	position: relative;
	margin:15px 0 50px 50px
}
#tag-shapes li:before {
	content: '';
	position: absolute;
	left: -20px;
	top: 0;
	width: 0;
	height: 0;
	border-top: 20px solid transparent;
	border-bottom: 20px solid transparent;
	border-right: 20px solid #2AADA2;
}
#tag-shapes li:after {
	content: '';
	position: absolute;
	left: 3px;
	top: 14px;
	width: 12px;
	height: 12px;
	background: #fff;
	border-radius: 50%;
}