MediaWiki:Common.css

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.image-link {
    position: relative;
    text-decoration: none;
}

.image-preview {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 200px; /* Adjust as needed */
    height: 200px; /* Adjust as needed */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: none;
    border: 1px solid #ccc;
    z-index: 10;
}

.image-link:hover + .image-preview {
    display: block;
}