MediaWiki:Common.css

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/* 1. Force the 300px image to shrink and FIT inside the 60x80 box */
.mw-parser-output .coverSmall img.zoom-img {
    width: 100% !important;   /* Makes it fill the width of the 60px box */
    height: 100% !important;  /* Makes it fill the height of the 80px box */
    object-fit: contain;      /* THE FIX: Shrinks the whole image to fit without cropping */
    display: block;
    transition: transform 0.2s ease-in-out !important;
}

/* 2. The Hover State - Magnification */
.coverThumb:hover .coverSmall {
    overflow: visible; 
}

.coverThumb:hover .coverSmall img.zoom-img {
    position: absolute;
    top: 0;
    left: 0;
    
    /* The size of the magnified preview */
    width: 250px !important; 
    height: auto !important;
    
    /* Keep the full image visible when zoomed too */
    object-fit: contain !important; 

    /* Move it to the right */
    transform: translate(70px, -20px) !important; 
    
    z-index: 10000 !important;
    box-shadow: 0 5px 20px rgba(0,0,0,0.5);
    border: 1px solid #888;
    background: #fff;
    max-width: none !important;
}