用◇制作三角

<i><s>◇</s></i>

i{
    display: inline-block;
        width: 15px;
        height: 8px;
        position: absolute;
        top: 12px;
        right:2px;
        overflow:hidden;
}
s{
   font: 400 15px/15px consolas;
        position: absolute;
        display: inline-block;
        top:-7px;
}