MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.custom-tooltip {
    position: relative;
    cursor: pointer;
    border-bottom: 1px dotted black; /* Makes it look like a link */
}

.tooltip-content {
    display: none; /* Initially hide the tooltip */
    position: absolute;
    top: 1.5em;
    left: 0;
    background: white;
    border: 1px solid black;
    padding: 5px;
    z-index: 100;
    width: auto;
    max-width: 250px;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
}

.custom-tooltip:hover .tooltip-content {
    display: block; /* Show the tooltip on hover */
}