In the Fans United Settings page, you will see a section dedicated to styling options, where you can define different colors. Each styling option has 2 variants for default and dark theme. For instance: [Default] Tab Background & [Dark theme] Tab Background.
If your website has a single-themed design, you need to change the styling on the [Default] group. If you support 2 themes, you need to change both.
The theme switch can happen if you add:
- data-theme="dark" attribute to html, body or other main div element or;
- .dark class on html or body elements
Once you do this, the colors from the dark theme will automatically be applied.