MediaWiki:Common.css

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/* Tighten vertical space in cover cells only */
.mw-parser-output .wikitable td:first-child {
    padding-top: 4px !important;     /* was probably 8–12px or more */
    padding-bottom: 4px !important;
    vertical-align: middle !important;  /* keeps image centered vertically */
}

/* Ensure the preview container hugs the image tightly */
.mw-parser-output .cover-preview {
    position: relative;
    display: inline-block;
    width: 80px;                     /* your thumb width */
    height: auto;
    line-height: 1;                  /* crucial: kills extra line spacing */
    margin: 0;                       /* no extra margins */
}

/* Force the small image to have no extra space around it */
.mw-parser-output .cover-preview .cover-small {
    display: block;
    margin: 0 auto;                  /* centers if needed */
    line-height: 1;
    vertical-align: middle;
}

/* Optional: if rows are still tall due to text in other columns, constrain overall row */
.mw-parser-output .wikitable tr {
    line-height: 1.2;                /* default is often 1.5–1.6; lower it slightly */
}

/* If needed: target the whole cover column for even tighter padding */
.mw-parser-output .wikitable td:first-child .cover-preview img {
    margin: 0 !important;
    padding: 0 !important;
}