MediaWiki:Citizen.css

/* All CSS here will be loaded for users of the Citizen skin */
:root.skin-citizen-dark {
    --color-primary__l: 60%;
    --color-primary__h: 205;
    --color-primary__s: 54%;
    /* Main background */
    --color-surface-0: hsl(var(--color-primary__h),35%,12%);
    /* Background for dropdowns etc. */
    --color-surface-1: hsl(var(--color-primary__h),35%,12%);
    /* Footer and legend background */
    --color-surface-2: hsl(var(--color-primary__h),35%,16%);
    /* Color for the sticky header */
    --background-color-overlay: hsl(var(--color-primary__h),35%,12%);
    /* Buttons, links etc. This was based on the buttons on Stake, but it was too blue for links etc. */
    --color-primary: #4698D6;
    /* primary l * 1.2 */
    --color-primary--active: #54B5FF;
    /* primary l * 0.8 */
    --color-primary--hover: #3879AB;
    /* Background for red warning box, default is too muted */
    --background-color-destructive: rgba(221,51,51,0.25);
}