MediaWiki:Common.css

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.mw-parser-output .cover-preview {
    position: relative;
    display: inline-block;
    line-height: 0; /* removes extra space */
}

.mw-parser-output .cover-preview .cover-small {
    transition: opacity 0.15s ease; /* optional fade */
}

.mw-parser-output .cover-preview .cover-large {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    opacity: 0;
    pointer-events: none; /* so hover stays on the container */
    transition: opacity 0.2s ease, transform 0.2s ease;
    transform: scale(1.05); /* slight pop if you want */
    background: #fff;
    border: 1px solid #aaa;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.mw-parser-output .cover-preview:hover .cover-small {
    opacity: 0; /* hide small one */
}

.mw-parser-output .cover-preview:hover .cover-large {
    opacity: 1;
    transform: scale(1); /* reset if you added pop */
}

/* Optional: shift position so it doesn't cover the table too much */
.mw-parser-output .cover-preview:hover .cover-large {
    left: 90px;   /* nudge right so it pops out of cell */
    top: -40px;   /* nudge up a bit */
}

/* Make sure the cell allows overflow */
.wikitable td:first-child {
    overflow: visible !important;
    position: relative !important;
}