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#triangle-up { width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-bottom: 100px solid red;} |
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#triangle-down { width: 0; height: 0; border-left: 50px solid transparent; border-right: 50px solid transparent; border-top: 100px solid red;} |
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#triangle-left { width: 0; height: 0; border-top: 50px solid transparent; border-right: 100px solid red; border-bottom: 50px solid transparent;} |
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#triangle-right { width: 0; height: 0; border-top: 50px solid transparent; border-left: 100px solid red; border-bottom: 50px solid transparent;} |
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#triangle-topleft { width: 0; height: 0; border-top: 100px solid red; border-right: 100px solid transparent;} |
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#triangle-topright { width: 0; height: 0; border-top: 100px solid red; border-left: 100px solid transparent;} |
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#triangle-bottomleft { width: 0; height: 0; border-bottom: 100px solid red; border-right: 100px solid transparent;} |
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#triangle-bottomright { width: 0; height: 0; border-bottom: 100px solid red; border-left: 100px solid transparent;} |
原文：http://www.cnblogs.com/zhishaofei/p/4160636.html