#tooltip{position:relative}#tooltiptext{visibility:hidden;color:#fff;text-align:center;z-index:1;opacity:0;background-color:#555;border-radius:6px;width:250px;margin-left:-130px;padding:10px;transition:opacity .3s;position:absolute;bottom:100%;left:50%}#tooltip:hover #tooltiptext{visibility:visible;opacity:1}