MediaWiki:Common.css

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/* Target the image strictly by its parent hierarchy */

/* 1. The Normal State: Force the 300px/400px image to shrink */
.mw-parser-output .coverThumb .coverSmall a img,
.mw-parser-output .coverThumb .coverSmall img {
    width: 60px !important;   /* Force shrink width */
    height: 80px !important;  /* Force shrink height */
    object-fit: contain !important; /* Fit the whole image in the box */
    display: block !important;
    transition: transform 0.2s ease !important;
}

/* 2. The Hover State: Blow it back up */
.mw-parser-output .coverThumb:hover .coverSmall img {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    
    /* This makes it use its natural 300px/400px size again */
    width: 300px !important; 
    height: auto !important;
    
    transform: translate(70px, -20px) !important;
    z-index: 10000 !important;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5) !important;
    border: 1px solid #888 !important;
    background: #fff !important;
    max-width: none !important;
}

/* 3. Ensure the table doesn't hide the zoom */
.mw-parser-output .wikitable td {
    overflow: visible !important;
}

.mw-parser-output .coverThumb:hover .coverSmall {
    overflow: visible !important;
}