Missing Frame/Not Appearing (Tkinter, Python)

I’m trying to create a GUI and was using Tkinter to create that GUI, I had one root with three different frames, one on the top, on the bottom left and one on the bottom right. The top hasn’t been appearing and i was wondering if i did something wrong and how i could fix it. (I’m also very new to Tkinter and Python)

import tkinter as tk
from typing import Text
MainRoot= tk.Tk()
MainRoot.wm_geometry("800x500")
MainRoot.wm_title("Encode")



Encode_Frame = tk.Frame(MainRoot, bg="Gray", height=400, width=400)
Encode_Frame.pack(anchor="s",side=tk.LEFT)

Decode_Frame = tk.Frame(MainRoot, bg="Blue", height= 400, width=400)
Decode_Frame.pack(anchor="s",side=tk.RIGHT)

Text_Frame= tk.Frame(MainRoot,bg="Red",height=100,width=800)
Text_Frame.pack(side=tk.TOP, anchor= "n")



MainRoot.mainloop()

>Solution :

Your window isn’t wide enough.

Use: MainRoot.wm_geometry("900x500").

(And add MainRoot.mainloop() at the bottom.)