.icon-hover{position:relative}.icon-hover::after{content:attr(data-tooltip);position:absolute;bottom:100%;left:50%;transform:translateX(-50%);background-color:rgba(0,0,0,0.7);color:#fff;padding:5px;border-radius:5px;white-space:nowrap;opacity:0;transition:opacity 0.3s}.icon-hover:hover::after{opacity:1}