Is there a way to change the button color or font styles in the form?

Is there a way to change the button color or font styles in the form?

Yes, you can update the button color & font styles bases on your preferences.

Open Formfacade sidebar widget in your Google Form > Click on "Customize" to open Forfacade form preview > Click on "edit icon" in the header > Select “Advanced” Tab > Update color, font and click on "Save".