How to set button white color on dark widget in kivy?

Question

Kivy

Good day, I ran into the following problem:
There is a widget with a dark gray color, when a button is applied to it and background_color is assigned: (1, 1, 1, 1) the button takes the color of the parent widget, that is, it literally becomes transparent
How can I get around this feature of kivy?

Answer 1

background_normal=''