Ответ:

import tkinter as tk

root = tk.Tk()

root.title("Break Time")

root.geometry("400x200")

label = tk.Label(root, text="It's time for a break!", font=("Helvetica", 16), fg="red")

label.pack(pady=20)

button = tk.Button(root, text="OK", command=root.destroy)

button.pack()

root.mainloop()

Объяснение: