css3画出多边形、三角形、心形等各种不同的形状

1、三角形

<div class="arrow-up">
div>
<div class="arrow-down">
div>
<div class="arrow-left">
div>
<div class="arrow-right">
div>

/*箭头向上*/
.arrow-up {width:0; height:0; border-left:30px solid transparent;border-right:30px solid transparent;border-bottom:30px solid #fff;
}/*箭头向下*/
.arrow-down {width:0; height:0; border-left:20px solid transparent;border-right:20px solid transparent;border-top:20px solid #0066cc;
}
/*箭头向左*/
.arrow-left {width:0; height:0; border-top:30px solid transparent;border-bottom:30px solid transparent; border-right:30px solid yellow; 
}/*箭头向右*/
.arrow-right {width:0; height:0; border-top:50px solid transparent;border-bottom: 50px solid transparent;border-left: 50px solid green;
}

空心三角形

.top{width:10px;height:10px;border-top:2px solid #000;border-left:2px solid #000;transform:rotate(45deg);}.right{width:10px;height:10px;border-top:2px solid #000;border-right:2px solid #000;transform:rotate(45deg);}.bottom{width:10px;height:10px;border-bottom:2px solid #000;border-right:2px solid #000;transform:rotate(45deg);}.left{width:10px;height:10px;border-bottom:2px solid #000;border-left:2px solid #000;transform:rotate(45deg);}

2、平行四边形

#parallelogram { 
width: 150px; 
height: 100px; 
margin-left:20px; 
-webkit-transform: skew(20deg); 
-moz-transform: skew(20deg); 
-o-transform: skew(20deg); 
background: red; 
} 

3、梯形

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

4、六角星

#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; 
} 

5、五角星

#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; 
-moz-transform: rotate(35deg); 
-webkit-transform: rotate(35deg); 
-ms-transform: rotate(35deg); 
-o-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: ''; 
-webkit-transform: rotate(-35deg); 
-moz-transform: rotate(-35deg); 
-ms-transform: rotate(-35deg); 
-o-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; 
-webkit-transform: rotate(-70deg); 
-moz-transform: rotate(-70deg); 
-ms-transform: rotate(-70deg); 
-o-transform: rotate(-70deg); 
content: ''; 
} 

6、五角大楼

#pentagon { 
position: relative; 
width: 54px; 
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; 
} 

7、爱心

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

8、鸡蛋

#egg { 
display:block; 
width: 126px; 
height: 180px; -webkit-border-radius: 63px 63px 63px 63px / 108px 108px 72px 72px; 
border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%; 
} 

9、椭圆

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

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