css三角形triangle

实现效果如下：

<!-- html  -->
<div class="lhh-box">
    <span class="text">triangle</span>
    <span class="lhh-triangle-box">
        <span class="lhh-triangle top"></span>
        <span class="lhh-triangle bottom"></span>
    </span>
    <span class="lhh-triangle-box">
        <span class="lhh-triangle left"></span>
        <span class="lhh-triangle right"></span>
    </span>
</div>

/* css */
.lhh-triangle-box{
    position: relative;
    display: inline-block;
    width: 16px;
    height: 16px;
    vertical-align: middle;
    font-size: 0; /* 清除高度 */
}
.lhh-triangle{
    position: absolute;
    width: 0;
    height: 0;
    border: 8px solid transparent;
}
.lhh-triangle.top{
    left: 0;
    top: 50%;
    border-top-color: black;
}
.lhh-triangle.bottom{
    left: 0;
    bottom: 50%;
    border-bottom-color: green;
}
.lhh-triangle.left{
    top: 0;
    left: 50%;
    border-left-color: blue;
}
.lhh-triangle.right{
    top: 0;
    right: 50%;
    border-right-color: red;
}