kivy: change background color to white

A simple way is to simply draw a big white rectangle behind your root widget. For instance, in kivy language you could do

<YourRootWidget>:
    canvas.before:
        Color:
            rgba: 1, 1, 1, 1
        Rectangle:
            pos: self.pos
            size: self.size

I think you can also actually directly set the colour that kivy clears the window background with, which is exposed as Window.clearcolor. You would do this with

from kivy.core.window import Window
Window.clearcolor = (1, 1, 1, 1)

You would probably need to put this before anything else in your app, as it won't affect anything if run after the window has been created.

I have created a module for this purpose. Please check: Details on Github

#Change background color of a kivy layout
#Place the CustomGraphics.py file to a folder
#code starts here

import sys
sys.path.append([path to CustomGraphics.py])
from CustomModules import CustomGraphics
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label

class TestApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical', size=(Window.width, Window.height))
        label = Label(text="Remember my name: It's Smruti Ranjan Gochhayat")
        layout.add_widget(label)
        CustomGraphics.SetBG(layout, bg_color=[1,0,0,1])
        return layout
if __name__ == '__main__':
    TestApp().run()
    
#code ends here

I wish it is helpful for some people