css3.0实现的各种形状

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

 有兴趣的话，最好是自己试试以下！······

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

#circle {  100px; height: 100px; background: red; -moz-border-radius: 50px; -webkit-border-radius: 50px; border-radius: 50px; } 
/* Cleaner, but slightly less support: use "50%" as value */

#oval {  200px; height: 100px; background: red; -moz-border-radius: 100px / 50px; -webkit-border-radius: 100px / 50px; border-radius: 100px / 50px; }
 /* Cleaner, but slightly less support: use "50%" as value */

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

#triangle-down {  0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-top: 100px solid red; } 

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

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

#triangle-topleft {  0; height: 0; border-top: 100px solid red; border-right: 100px solid transparent; }

#triangle-topright {  0; height: 0; border-top: 100px solid red; border-left: 100px solid transparent; }

#triangle-bottomleft {  0; height: 0; border-bottom: 100px solid red; border-right: 100px solid transparent; } 

#triangle-bottomright {  0; height: 0; border-bottom: 100px solid red; border-left: 100px solid transparent; } 

#curvedarrow { position: relative;  0; height: 0; border-top: 9px solid transparent; border-right: 9px solid red; -webkit-transform: rotate(10deg);
 -moz-transform: rotate(10deg); -ms-transform: rotate(10deg); -o-transform: rotate(10deg); }
 #curvedarrow:after { content: ""; position: absolute; border: 0 solid transparent; border-top: 3px solid red; border-radius: 20px 0 0 0; top: -12px; 
left: -9px;  12px; height: 12px; -webkit-transform: rotate(45deg); -moz-transform: rotate(45deg); -ms-transform: rotate(45deg); 
-o-transform: rotate(45deg); }

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

#parallelogram {  150px; height: 100px; -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;  100px; }

#star-six {  0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid red;
 position: relative; } #star-six:after {  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;  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;  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;  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;  54px; border- 50px 18px 0; border-style: solid; border-color: red transparent; } 
#pentagon:before { content: ""; position: absolute; height: 0;  0; top: -85px; left: -18px; border- 0 45px 35px; border-style: solid; 
border-color: transparent transparent red; } 

#hexagon {  100px; height: 55px; background: red; position: relative; } 
#hexagon:before { content: ""; position: absolute; top: -25px; left: 0;  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;  0; height: 0; border-left: 50px solid transparent; 
border-right: 50px solid transparent; border-top: 25px solid red; }

#octagon {  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;  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;  42px; height: 0; }

#heart { position: relative;  100px; height: 90px; }
 #heart:before, #heart:after { position: absolute; content: ""; left: 50px; top: 0;  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;  212px; height: 100px; } 
#infinity:before, #infinity:after { content: ""; position: absolute; top: 0; left: 0;  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); } 

#diamond {  0; height: 0; border: 50px solid transparent; border-bottom-color: red; position: relative; top: -50px; }
 #diamond:after { content: ''; position: absolute; left: -50px; top: 50px;  0; height: 0; border: 50px solid transparent; border-top-color: red; }

#diamond-shield {  0; height: 0; border: 50px solid transparent; border-bottom: 20px solid red; position: relative; top: -50px; }
 #diamond-shield:after { content: ''; position: absolute; left: -50px; top: 20px;  0; height: 0; border: 50px solid transparent; 
border-top: 70px solid red; }

#diamond-narrow {  0; height: 0; border: 50px solid transparent; border-bottom: 70px solid red; position: relative; top: -50px; } 
#diamond-narrow:after { content: ''; position: absolute; left: -50px; top: 70px;  0; height: 0; border: 50px solid transparent; 
border-top: 70px solid red; }

#cut-diamond { border-style: solid; border-color: transparent transparent red transparent; border- 0 25px 25px 25px; height: 0;  50px;
 position: relative; margin: 20px 0 50px 0; }
 #cut-diamond:after { content: ""; position: absolute; top: 25px; left: -25px;  0; height: 0; border-style: solid; 
border-color: red transparent transparent transparent; border- 70px 50px 0 50px; } 

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

#pacman {  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 {  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;  0; height: 0; border-top: 13px solid transparent; 
border-right: 26px solid red; border-bottom: 13px solid transparent; }

#burst-12 { background: red;  80px; height: 80px; position: relative; text-align: center; }
 #burst-12:before, #burst-12:after { content: ""; position: absolute; top: 0; left: 0; height: 80px;  80px; background: red; } 
#burst-12:before { -webkit-transform: rotate(30deg); -moz-transform: rotate(30deg); -ms-transform: rotate(30deg); -o-transform: rotate(30deg); } 
#burst-12:after { -webkit-transform: rotate(60deg); -moz-transform: rotate(60deg); -ms-transform: rotate(60deg); -o-transform: rotate(60deg); }

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

#yin-yang {  96px; height: 48px; background: #eee; border-color: red; border-style: solid; border- 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%;  12px; height: 12px; } 
#yin-yang:after { content: ""; position: absolute; top: 50%; left: 50%; background: red; border: 18px solid #eee; border-radius:100%;
  12px; height: 12px; } 

#badge-ribbon { position: relative; background: red; height: 100px;  100px; -moz-border-radius: 50px; -webkit-border-radius: 50px; 
border-radius: 50px; } 
#badge-ribbon:before, #badge-ribbon:after { content: ''; position: absolute; border-bottom: 70px solid red; border-left: 40px solid transparent;
 border-right: 40px solid transparent; top: 70px; left: -10px; -webkit-transform: rotate(-140deg); -moz-transform: rotate(-140deg); 
-ms-transform: rotate(-140deg); -o-transform: rotate(-140deg); }
 #badge-ribbon:after { left: auto; right: -10px; -webkit-transform: rotate(140deg); -moz-transform: rotate(140deg); -ms-transform: rotate(140deg); 
-o-transform: rotate(140deg); }