如下所示：
直接上代碼！
<!DOCTYPE html><html lang="en"><head><title>小三角</title><style>.up-triangle{width:0px;height:0px;border-bottom:30px solid #000;border-left:15px solid transparent;border-right:15px solid transparent;margin:100px auto; }.down-triangle{width:0px;height:0px;border-top:30px solid #000;border-left:15px solid transparent;border-right:15px solid transparent; margin:100px auto; }.left-triangle{width:0px;height:0px;border-right:30px solid #000;border-top:15px solid transparent;border-bottom:15px solid transparent; margin:100px auto; }.right-triangle{width:0px;height:0px;border-left:30px solid #000;border-top:15px solid transparent;border-bottom:15px solid transparent; margin:100px auto; }</style></head><body><p class="up-triangle"></p><p class="down-triangle"></p><p class="left-triangle"></p><p class="right-triangle"></p></body></html>Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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