代码：css小图标

向下小箭头

.icon-tip{
    border-color: transparent transparent #bb0808 transparent;
    border-style:solid;
    border-width:10px;
    width:10px;
    height:10px;
    box-sizing:border-box;
    display:inline-block;
}
向下小箭头<div class="icon-tip"></div>

待补充