How to change the background color of the box in tkinter (python)

Question

I am new to the python language, and I have been learning tkinter. However I wonder how can I change the background of the box that pops up in tkinter.

import time
import tkinter
from tkinter import *
import sys
import os
root = tkinter.Tk()

Using this you get a grey box that pops up. How to I change the color of that box?

Answer 1

Configure the root:

root.configure(background='red')

You can also directly assign it to the bg property:

root['bg'] = 'red'

Answer 2

root.configure(background='black')