from tkinter import *

def click(event):
 root.configure(bg= '#ffffff')

def click1(event):
 root.configure(bg= '#000000')

root = Tk()
root.title("Python")
root.geometry('400x250')
root.configure(bg= '#ff5f00')



b = Button(root, text="Білий")
b.grid(column=0, row=0)
b.bind("<Button-1>", click)

b1 = Button(root, text="Чорний")
b1.grid(column=0, row=1)
b1.bind("<Button-1>", click1)


root.mainloop()