Pinafore-Web-Client-Frontend/scss/themes/_dark.scss

@mixin darkTheme() {
  $deemphasized-color: lighten($main-bg-color, 45%);

  --action-button-deemphasized-fill-color: #{$deemphasized-color};
  --action-button-deemphasized-fill-color-hover: #{lighten($deemphasized-color, 22%)};
  --action-button-deemphasized-fill-color-active: #{lighten($deemphasized-color, 5%)};
  --action-button-deemphasized-fill-color-pressed: #{darken($deemphasized-color, 7%)};
  --action-button-deemphasized-fill-color-pressed-hover: #{darken($deemphasized-color, 2%)};
  --action-button-deemphasized-fill-color-pressed-active: #{darken($deemphasized-color, 15%)};

  --loading-bg: #{#ededed};

  --deemphasized-text-color: #{$deemphasized-color};

  --very-deemphasized-link-color: #{rgba($anchor-color, 0.8)};
  --very-deemphasized-text-color: #{lighten($main-bg-color, 32%)};

  --status-direct-background: #{darken($body-bg-color, 5%)};
  --main-theme-color: #{$main-theme-color};
  --warning-color: #{#c7423d};
  --alt-input-bg: #{rgba($main-bg-color, 0.7)};

  --muted-modal-bg: #{transparent};
  --muted-modal-focus: #{#999};
  --muted-modal-hover: #{rgba(255, 255, 255, 0.2)};

  --compose-button-halo: #{rgba(255, 255, 255, 0.1)};
}