.tooltip {
    width: 18px;
    height: 18px;
    transition: transform .35s cubic-bezier(.2, .8, .2, 1), opacity .25s;
    position: relative;
}

/* tooltip */
.tooltip::after {
    content: attr(data-label);
    position: absolute;
    bottom: 130%;
    left: 50%;
    transform: translateX(-50%) scale(.8);
    background: #222;
    color: white;
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 6px;
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    transition: .2s;
    z-index: 99999999999999999;
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}