MediaWiki:Citizen.css

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/* Using :root forces the variables to load at the highest authority level */
:root,
.skin-theme-clientpref-night,
html.skin-citizen-dark {
    --color-surface-0: #1c1c1c !important; 
    --color-surface-1: #242424 !important; 
    --color-surface-2: #2b2b2b !important; 
    --color-surface-3: #323232 !important;
    --color-primary: #78a06f !important;
    --color-primary-variant: #5f875f !important;
}