How to display button (Tkinter) red or green when we got 0 or 1 data?

Question

I have project for read and show data from text file.

import os
import io

work_dir = "C:\\Users\\xxxxx\\labels"

for index in range(191, 221):
    name = "CushionOK_{index}.txt".format(index=index)
    path = os.path.join(work_dir, name)
    with io.open(path, mode="r", encoding="utf-8") as fd:
        content = fd.read(1)
int(content)

if int(content) == 1:
  print("OK")
else:
  print("NG")

From above code is show only OK or NG but I'd like to show button (Tkinter) red or green too.

For red(NG)

import tkinter as tk

root2 = tk.Tk()

tk.Button(root2,text='NG',font=('Helvetica bold',150), bg = "red").place(
            x=250, y= 250, w= 350, h= 350, anchor='center')

tk.Button(root2,text='Sign in', bg = "grey").place(x=250, y= 450,w= 60, h= 30,
                                                   anchor='center')

root2.geometry("500x500")
root2.mainloop()

For Red(NG) button will push sign in button for apply private code (Ex.1234) to show other folder.

and Green button(OK).

import tkinter as tk

root1 = tk.Tk()

tk.Button(root1,text='OK',font=('Helvetica bold',150), bg = "green").place(
            x=250, y= 250, w= 350, h= 350, anchor='center')

tk.Button(root1,text='Confirm', bg = "grey").place(
            x=250, y= 450,w= 60, h= 30, anchor='center')

root1.geometry("500x500")
root1.mainloop()

For Green button will push confirm button for close it.

I'd like to show button (Tkinter) red or green for represent 0 (red button) or 1 (green button). Now I can create separate code but I'd like to add all code together.