[Python] I try to change the background color of topappbar

I am new to kivymd, using version 2.0.1dev0 and I want to apply TopAppBar but when I try to change the background color it just doesn't work and only shows white color. This is my code

enter image description here : MDScreen: MDNavigationLayout: MDScreenManager: MDScreen: name: "main_screen"

MDTopAppBar:
type: "small"
md_bg_color: 0.2,0.4,0.8,1

MDTopAppBarLeadingButtonContainer:

MDActionTopAppBarButton:
icon: "menu"

MDTopAppBarTitle:
text: "Página Principal"

MDTopAppBarTrailingButtonContainer:

MDActionTopAppBarButton:
icon: "dots-vertical"


Note: The code is executed and manages to display the window with the bar.

I tried changing the md_bg_color option on different lines but it doesn't work, I also read the kivy documentation but it doesn't mention color so I'm afraid there is no such option. I hope someone has a solution.

Thank you so much.

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