import tkinter as tk
root = tk.Tk()
root.wait_visibility(root)
root.wm_attributes("-fullscreen", 1)
root.wm_attributes("-transparentcolor", root['bg'])
frame = tk.Frame(root)
frame.pack()
canvas = tk.Canvas(frame, width=root.winfo_width(), height=root.winfo_height())
canvas.pack()
canvas.create_rectangle(50, 25, 150, 75, fill="red")
root.mainloop()
