Common.css

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/* CSS placed here will be applied to all skins */
/* remove tagline: https://www.mediawiki.org/wiki/Manual:Tagline_%28Site_Subtitle%29 */
#siteSub { display:block; }

/* remove toc:  https://www.mediawiki.org/wiki/Manual:FAQ#How_can_I_hide_the_table_of_contents.3F */
.toc, #toc { display: none; }

/* from https://www.mediawiki.org/wiki/MediaWiki:Gadget-site.css */
.page-MediaWiki #lastmod,
.page-MediaWiki #siteSub,
.page-MediaWiki #contentSub,
.page-MediaWiki .subtitle,
.page-MediaWiki #jump-to-nav,
.page-MediaWiki .firstHeading {
	display: none;
}