[Python] i tried using pack() but it does not give me the result i wanted

my code aims to move this purple square to the right but for some reason the square is in the middle. I put pack(side='right') but when i ran the code, it still puts the square in the middle.

import tkinter as ttk
import tkinter as tk
from tkinter import*



class WebsiteGUI:
def __init__(self, root):
self.root = root
self.root.title('GUI')
self.root.attributes('-fullscreen',False )

main_screen = tk.Frame(root,height=1080, width= 1920,background = '#e4e4e4', )
main_screen.pack()




screen2 = tk.Frame(main_screen,height=100, width= 100, background = '#472882')
screen2.pack(side= 'right', fill ='both', padx=10, pady=5, expand=True)


root= ttk.Tk()
WebsiteGUI(root)
root.geometry('1920x1080')
root.mainloop()

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