纯CSS画的基本图形（矩形、圆形、三角形、多边形、爱心、八卦等）

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

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

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

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

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

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

#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; 
-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: ‘‘; 
} 

#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; 
} 

#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: ""; 
position: absolute; 
top: 0; 
left: 0; 
border-bottom: 29px solid red; 
border-left: 29px solid #eee; 
border-right: 29px solid #eee; 
width: 42px; 
height: 0; 
} 
#octagon:after { 
content: ""; 
position: absolute; 
bottom: 0; 
left: 0; 
border-top: 29px solid red; 
border-left: 29px solid #eee; 
border-right: 29px solid #eee; 
width: 42px; 
height: 0; 
} 

#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%; 
} 

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

#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%; 
} 

#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 { 
-webkit-transform: rotate(30deg); 
-moz-transform: rotate(30deg); 
-ms-transform: rotate(30deg); 
-o-transform: rotate(30deg); 
transform: rotate(30deg); 
} 
#burst-12:after { 
-webkit-transform: rotate(60deg); 
-moz-transform: rotate(60deg); 
-ms-transform: rotate(60deg); 
-o-transform: rotate(60deg); 
transform: rotate(60deg); 
} 

#burst-8 { 
background: red; 
width: 80px; 
height: 80px; 
position: relative; 
text-align: center; 
-webkit-transform: rotate(20deg); 
-moz-transform: rotate(20deg); 
-ms-transform: rotate(20deg); 
-o-transform: rotate(20eg); 
transform: rotate(20deg); 
} 
#burst-8:before { 
content: ""; 
position: absolute; 
top: 0; 
left: 0; 
height: 80px; 
width: 80px; 
background: red; 
-webkit-transform: rotate(135deg); 
-moz-transform: rotate(135deg); 
-ms-transform: rotate(135deg); 
-o-transform: rotate(135deg); 
transform: rotate(135deg); 
} 

#cut-diamond { 
border-style: solid; 
border-color: transparent transparent red transparent; 
border-width: 0 25px 25px 25px; 
height: 0; 
width: 50px; 
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; 
} 

#yin-yang { 
width: 96px; 
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; 
} 
#yin-yang:after { 
content: ""; 
position: absolute; 
top: 50%; 
left: 50%; 
background: red; 
border: 18px solid #eee; 
border-radius:100%; 
width: 12px; 
height: 12px; 
}