How to white text in button on Top navigation

Hi I enabled the button in the top navigation. I have dark orange as my theme color, but how can I make the text color of “Log in” white?

Hi there

The system decides that text color automatically based on the Accent color in the Theme of the app. If that color is light, the button text is black, and if that’s dark, it’s white. You can play around and make sure yourself.