MediaWiki:Common.css

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.mw-parser-output .cover-preview .cover-large {
    position: absolute !important;
    top: -20px !important;
    left: 90px !important;
    z-index: 100 !important;
    opacity: 0 !important;
    visibility: hidden !important;   /* extra layer of hiding */
    pointer-events: none !important;
    transition: opacity 0.25s ease !important;
    background: #fff;
    border: 1px solid #999;
    box-shadow: 0 10px 30px rgba(0,0,0,0.6);
    padding: 4px;
}

.mw-parser-output .cover-preview:hover .cover-large {
    opacity: 1 !important;
    visibility: visible !important;
}

.mw-parser-output .cover-preview:hover .cover-small {
    opacity: 0 !important;
    visibility: hidden !important;   /* helps if opacity alone fails */
}

/* Ensure small thumb stays visible normally */
.mw-parser-output .cover-preview .cover-small {
    opacity: 1 !important;
    visibility: visible !important;
    display: block !important;
}