MediaWiki:Citizen.css

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/* All CSS here will be loaded for users of the Citizen skin */
:root.skin-theme-clientpref-dark {
    --color-surface-0: #050e1b;
    --color-surface-1: #0d1014;
    --color-base: #fff;
    --color-base--emphasized: #808080;
    --color-base--subtle: #162132;
}
:root.skin-theme-clientpref-os {
    --color-surface-0: #050e1b;
    --color-surface-1: #0d1014;
    --color-base: #fff;
    --color-base--emphasized: #808080;
    --color-base--subtle: #162132;
}