MediaWiki:Common.css

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/* Base container */
.mw-parser-output .coverThumb {
    display: inline-block;
    position: relative;
    line-height: 0;          /* helps avoid extra line spacing */
}

/* The image inside (with link or without) */
.mw-parser-output .coverThumb img.mw-file-element {
    transition: transform 0.15s ease;
    transform-origin: top left;
    box-sizing: border-box;
}

/* Hover — scale the image directly */
.mw-parser-output .coverThumb:hover img.mw-file-element {
    transform: scale(3.5);     /* adjust 3–4.5 depending on taste */
    z-index: 9999;
    background: #fff;
    border: 1px solid #aaa;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    pointer-events: none;
}

/* Optional: if you want it centered-ish instead of top-left growth */
.mw-parser-output .coverThumb:hover img.mw-file-element {
    transform-origin: center center;
    transform: scale(3.5);
}