#powerTip{cursor:default;background-color:rgba(0,0,0,.8);border-radius:6px;color:#fff;display:none;padding:10px;position:absolute;z-index:2}#powerTip.n:before{content:"";position:absolute;border-right:5px solid transparent;border-left:5px solid transparent;left:50%;margin-left:-5px;border-top:10px solid rgba(0,0,0,.8);bottom:-10px}