.triangleTest .content div{margin-bottom:20px;width:0;height:0}.triangleTest .content div.up{border-left:50px solid transparent;border-right:50px solid transparent;border-bottom:100px solid red;border-top:0}.triangleTest .content div.left{border-left:50px solid red;border-top:50px solid red;border-right:50px solid transparent;border-bottom:50px solid transparent}.triangleTest .content div.right{border-right:50px solid red}.triangleTest .content div.bottom-left,.triangleTest .content div.right{border-left:50px solid transparent;border-top:50px solid transparent;border-bottom:50px solid red}.triangleTest .content div.bottom-left{width:120px;height:120px;background-color:transparent;border-right:50px solid transparent}.triangleTest #box{width:160px;height:160px;background:#ff0;border-top:80px solid red;border-right:80px solid #000;border-bottom:80px solid green;border-left:80px solid #00f}