Template:Tooltip/styles.css

.tooltip {
    position: absolute;
    left: 0;
    right: 0;
    margin: 5px 10px;
    padding: 10px 15px;
    background: white;
    color: #54595d;
    box-shadow: 0 14px 28px rgba(0,0,0,0.0625), 0 10px 10px rgba(0,0,0,0.055);
    opacity: 0;
    visibility: hidden;
    user-select: none;
    transition: opacity 0.2s ease,box-shadow 0.2s ease;
}

/* Trigger */
.tooltip-target:hover .tooltip {
    opacity: 1;
    visibility: visible;
    user-select: auto;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    .tooltip {
        background: #33363d;
        color: #c1c2c5;
    }
}