MediaWiki:Common.css

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html,
body {
    color: #fff;
    background-color: #000;
}

/* Make content areas transparent so the background shows through */
/* Timeless was chosen as the default skin because it's optimized for responsive screen sizes */
body.skin-timeless .mw-body,
body.skin-timeless .mw-body-content,
body.skin-timeless .content-wrapper,
body.skin-timeless .page-container {
    background-color: transparent !important;
}

/* Doing it this way instead of ".wikitable th" is more proper because it only applies to the top-level <th> and not nested tables used for formatting purposes */
.wikitable > tr > th,
.wikitable > * > tr > th {
    color: #fff;
    background-color: #76f;
}