Theming

Citizen allows you to customize the interface to match your brand or personal preference. With just a few CSS variables, you can completely change the look and feel of your wiki.

Colors

Citizen's color system is designed to be flexible and accessible.

Primary color

Citizen uses the OKLCH color model for its primary color system to ensure consistent theming across light and dark mode. The default progressive color is a standard blue (#36c), but you can change it by updating the hue, chroma, and lightness variables.

Property	Description	Default value
--color-progressive-oklch__l	Lightness of the primary color.	53.25%
--color-progressive-oklch__c	Chroma (saturation) of the primary color.	0.1679
--color-progressive-oklch__h	Hue of the primary color. affects text and surface accents.	262.29

Deprecated

The HSL fallback variables are soft-deprecated and will be removed in a future version. We recommend using the OKLCH variables above.

Property	Description
--color-progressive-hsl__h	Hue (affects accents)
--color-progressive-hsl__s	Saturation
--color-progressive-hsl__l	Lightness

Surface color

These variables control the background colors of various UI elements.

Property	Description
--color-surface-0	The main site background.
--color-surface-1	Secondary surfaces like modals and dropdowns.
--color-surface-2	Tertiary surfaces.
--color-surface-3	Quaternary surfaces.
--color-surface-4	Quinary surfaces.

Text color

Adjust these variables to change the readability and hierarchy of your text.

Property	Description
--color-base	The default body text color.
--color-emphasized	High-contrast text for titles and headers.
--color-subtle	Low-contrast text for captions and metadata.
--color-link	The default body link color.

Typography

Define the fonts used throughout your wiki. Since Citizen relies heavily on font weights, we recommend using variable fonts to ensure styles are preserved correctly.

Property	Description	Default value
--font-family-citizen-base	The default font used for most text.	'Roboto'
--font-family-citizen-serif	Serif font used for blockquotes and specific accents.	'Roboto Serif'
--font-family-citizen-monospace	Monospace font used for code blocks and editors.	'Roboto Mono'

Layout

You can control the maximum width of the page content using the --width-layout variable. This can be applied to the :root or body element.

Option	Selector	Default value
Standard	:root.citizen-feature-custom-width-clientpref-standard	1080px
Wide	:root.citizen-feature-custom-width-clientpref-wide	1600px
Full	:root.citizen-feature-custom-width-clientpref-full	100vw

Theme modes

Citizen provides built-in support for Light, Dark, and Pure Black modes, as well as an Automatic mode that follows the user's device settings.

Theme	Class	Notes
Light mode	.skin-theme-clientpref-day
Dark mode	.skin-theme-clientpref-night
Pure black mode	.skin-theme-clientpref-night.citizen-feature-pure-black-clientpref-1	Available only when Dark mode is active.
Automatic mode	.skin-theme-clientpref-os	Respects the device's system preference.
Performance mode	.citizen-feature-performance-mode-clientpref-1	Can be used to target low-performance mode

Recipes

Here are some common customizations you can apply to your wiki.

Customizing the primary color

To change the primary color (for example, to purple) only in light mode:

:root.skin-theme-clientpref-day {
    /* Set hue to purple */
    --color-progressive-oklch__h: 301.11;
}

To change the color for automatic mode (when the device is in dark mode):

@media screen and (prefers-color-scheme: dark) {
    :root.skin-theme-clientpref-os {
      --color-progressive-oklch__h: 301.11;
    }
}

TIP

If you are customizing both standard Dark mode and Pure Black mode, you can target standard Dark mode specifically using .skin-theme-clientpref-night.citizen-feature-pure-black-clientpref-0.

Disabling image zoom

By default, images slightly zoom in when hovered. You can disable this effect:

:root {
    --transform-image-hover: none;
}

Disabling frosted glass

To remove the frosted glass effect from sticky headers and other overlays:

:root {
    --backdrop-filter-frosted-glass: none;
    --opacity-glass: 1;
}

Disabling automatic mode

To disable automatic mode, add this in your CSS. Ensure that $wgCitizenThemeDefault is set to either light or dark mode.

#skin-client-prefs-skin-theme .citizen-client-prefs-radio:has(input[value="os"]) {
    display: none;
}

#skin-client-prefs-skin-theme form { 
   grid-template-columns: repeat(2,1fr);
}

Disabling autohide navigation for mobile

Add this in your CSS to disable the autohide navigation for mobile devices:

#skin-client-prefs-citizen-feature-autohide-navigation { 
 display: none !important; 
}

Disabling pure black mode

To disable pure black mode:

#skin-client-prefs-citizen-feature-pure-black {
    display: none;
}