.__tooltip__ {
    display: none;
    width: max-content;
    position: absolute;
    top: 0;
    left: 0;
    background: #222;
    color: white;
    font-weight: bold;
    padding: 5px;
    border-radius: 4px;
    font-size: 9pt;

    opacity: 0;
    animation: .6s ease-out .3s forwards __tooltip-fadeIn__;
}
@keyframes __tooltip-fadeIn__ {
    from { opacity: 0; }
    to { opacity: 1; }
}

.__tooltip__ .__tooltip-arrow__ {
    position: absolute;
    background: #222;
    width: 8px;
    height: 8px;
    transform: rotate(45deg);
}