The Dark Mode color palette can be customized from the Site Editor by clicking the Styles icon in the top right of the screen.
- Navigate to Appearance > Editor
- Click on the Styles button in the top right corner (light/dark circle)
- Click Colors
- Click Palette
- Click the Custom tab
- In the Custom section, click the Add ➕ button
- Select your colors and then give each color a name beginning with Dark Mode, for example:
Dark Mode Foreground - Click Done and click Save to save your changes