利用css3特性写出三角形（兼容IE浏览器）

利用CSS写出三角形的效果

效果如图：

代码如下：

.triangle-up {
        width:0px;
        height:0px;
        border-left:10px solid transparent;
        border-right:10px solid transparent;
        border-bottom:10px solid red;
        font-size:0px;
        line-height:0px;
        margin: 0 auto;
    } 

.triangle-down {
        width:0px;
        height:0px;
        border-left:10px solid transparent;
        border-right:10px solid transparent;
        border-top:10px solid blue;
        font-size:0px;
        line-height:0px;
    } 

.triangle-left {
        width:0px;
        height:0px;
        border-bottom:10px solid transparent;
        border-top:10px solid transparent;
        border-right:10px solid #DC143C;
        font-size:0px;
        line-height:0px;
    }
 .triangle-right {
        width:0px;
        height:0px;
        border-bottom:10px solid transparent;
        border-top:10px solid transparent;
        border-left:10px solid #FF00FF;
        font-size:0px;
        line-height:0px;
    }