Change cart icon on fixed menu

Hello
In your DBC Plugin Settings, it is easy to set the color of a cart icon.
But it is not easy to have it in a different color if the menu color changes.
For example, if I set it as black on the white menu, after scrolling on the dark fixed menu, it will be invisible.
How to assign two different colors?
I want to have it black on the primary menu and white on the fixed menu without any extra CSS dances around it…

Thanks.