css三角形的画法

效果图：

css画法：

.heise>div>span{
    display: inline-block;
    width: 0;
    height: 0;
    border-top: 10px solid transparent;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid white;
    position: absolute;
    top: 60px;
}