MediaWiki:Citizen.css

:root.skin-citizen-dark{
    --color-surface-0: red;
    --color-surface-1: lime;
    --color-surface-2: fuchsia;
    --color-surface-3: yellow;
    --color-surface-4: aqua;
    --color-base: blue;
    --color-base--emphasized: darkblue;
    --color-base--subtle: cornflowerblue;
}