Editing Template:Static row numbers/styles.css

/**
 * Add a static (unsortable) column of numbers to the left of a table.
 * Optionally disable numbers on specific rows for headers (no borders) or data
 * (borders). Optionally display column header text: "No." or hash ("#").
 *
 * Classes:
 * - table.static-row-numbers
 * - table.static-row-header-text
 * - table.static-row-header-hash
 * - tr.static-row-header
 * - tr.static-row-numbers-norank
 *
 * Tested:
 * - Windows 10: (all skins) Chrome, Firefox, Edge.
 * - Android Galaxy S21 (MinervaNeue): Chrome, Firefox.
 * - Wikipedia Android app.
 * - Print.
 * - No JavaScript.
 * - Sticky gadget in Windows browsers (default skin).
 * - Dark Reader browser extention in Windows browsers (default skin).
 *
 * Notes:
 * - Sortable moves to thead any header rows and (after sort) sorttop rows.
 * - Sticky gadget (.mw-sticky-header) moves to thead any wikitable header rows.
 */
.static-row-numbers {
  counter-reset: rowNumber;
}
.static-row-numbers tr::before {
  content: "";
  display: table-cell;
  padding-right: 0.5em;
  padding-left: 0.5em;
  text-align: right;
  vertical-align: inherit;
}
.static-row-numbers.static-row-numbers-left tr::before {
	text-align: left;
}
.static-row-numbers.static-row-numbers-center tr::before {
	text-align: center;
}
.static-row-numbers.wikitable tr::before {
  background-color: var(--background-color-neutral, #eaecf0);
}
body.skin-minerva .static-row-numbers.wikitable tr::before {
  background-color: var(--background-color-neutral, #eaecf0);
  color: var(--color-base, #202122);
}

/**
 * Add count to all tbody rows except for two classes. If no thead, skip the
 * first tbody row which may not have one of the two classes:
 */
.static-row-numbers thead + tbody tr:first-child:not(.static-row-header):not(.static-row-numbers-norank)::before,
.static-row-numbers tbody tr:not(:first-child):not(.static-row-header):not(.static-row-numbers-norank)::before {
  counter-increment: rowNumber;
  content: counter(rowNumber);
}

/**
 * Add column label to first row in thead or, if no thead, in tbody:
 */
.static-row-header-text.static-row-numbers thead tr:first-child::before,
.static-row-header-text.static-row-numbers caption + tbody tr:first-child::before,
.static-row-header-text.static-row-numbers tbody:first-child tr:first-child::before {
  content: "No.";
  font-weight: bold;
}
.static-row-header-hash.static-row-numbers thead tr:first-child::before,
.static-row-header-hash.static-row-numbers caption + tbody tr:first-child::before,
.static-row-header-hash.static-row-numbers tbody:first-child tr:first-child::before {
  content: "#";
  font-weight: bold;
}

/**
 * Add borders in numbers column.
 *
 * Windows Firefox tr::before doesn't inherit color, so hard set.
 */
/* Wikitable. */
.static-row-numbers.wikitable tr::before {
  border: 0 solid var(--border-color-base, #a2a9b1);
}
.static-row-numbers.wikitable thead + tbody tr:first-child:not(.static-row-header)::before,
.static-row-numbers.wikitable tbody tr:not(:first-child):not(.static-row-header)::before {
  border-width: 1px;
}
body.skin-monobook .static-row-numbers.wikitable tr::before {
  border-color: #aaaaaa;
}
body.skin-timeless .static-row-numbers.wikitable tr::before {
  border-color: #c8ccd1;
}
body.skin-minerva .static-row-numbers.wikitable tr::before {
  border-color: rgba(84,89,93,.3);
}
/* Plain with border. */
table[border].static-row-numbers:not(.wikitable) tr::before {
  border: 0 inset #202122;
}
table[border].static-row-numbers:not(.wikitable) thead + tbody tr:first-child:not(.static-row-header)::before,
table[border].static-row-numbers:not(.wikitable) tbody tr:not(:first-child):not(.static-row-header)::before {
  border-width: 1px;
}
body.skin-monobook table[border].static-row-numbers:not(.wikitable) tr::before,
body.skin-timeless table[border].static-row-numbers:not(.wikitable):not(.mw-datatable) tr::before {
  border-color: #000000;
}
/* Plain with optional border + .mw-datatable. */
body.skin-timeless .static-row-numbers.mw-datatable:not(.wikitable) tr::before {
  border: 0 solid #c8ccd1;
}
body.skin-timeless .static-row-numbers.mw-datatable:not(.wikitable) thead + tbody tr:first-child:not(.static-row-header)::before,
body.skin-timeless .static-row-numbers.mw-datatable:not(.wikitable) tbody tr:not(:first-child):not(.static-row-header)::before {
  border-width: 1px;
}
/* Minerva mobile. */
@media all and (max-width: 720px) {
  /* Wikitable. */
  body.skin-minerva .static-row-numbers.wikitable tr::before {
    border-left-width: 1px;
  }
  body.skin-minerva .static-row-numbers.wikitable thead tr:first-child::before,
  body.skin-minerva .static-row-numbers.wikitable caption + tbody tr:first-child::before,
  body.skin-minerva .static-row-numbers.wikitable tbody:first-child tr:first-child::before {
    border-top-width: 1px;
  }
  body.skin-minerva .static-row-numbers.wikitable tbody tr:last-child::before,
  body.skin-minerva .static-row-numbers.wikitable tfoot tr:last-child::before {
    border-bottom-width: 1px;
  }
}