MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
:root {
  --layout-topbar-height: 35px; /* height of topbar */
  --layout-sidespace: 24px; /* whitespace width on most left and most right */
  --layout-content-width: minmax(0,1fr);
  
  --font-size: 14px;
  --line-height: 24px;
  --font-size-s: 12px;
  --line-height-s: 20px;
  --font-size-l: 16px;
  --line-height-l: 24px;
  --font-size-xs: 10px;
  --line-height-xs: 16px;
  
  --theme-text-color: #fff;
  --theme-site-background: #141;
  --theme-header-background: #151;
}