Fading a window to a specific color in tkinter

Question

Im making a transition screen in Tkinter between the loading screen and the actual inteface, and my desired behaviour is for the entire window fade to a shade of black, resize itself to the size of the inteface, before fading back in to the interface. The things I saw with root.attribute would not work because it would simply turn the screen transparent which is not what I want. This is the code I have so far, except I dont have the fading part.

import tkinter as tk

moduleImportList = [
    'from keras.models import Sequential',
    'from keras.layers import Dense',
    'import pandas as pd',
]

class mainGUI:
    def __init__(self, master):
        self.master = master
        master.title('Loading screen test')
        master.config(bg="#1f1f1f")
        master.resizable(False,False)
        master.geometry('300x100')
        master.eval('tk::PlaceWindow . center')
        self.loadingScreen = tk.Label(master,text='Loading...',font=('ariel 30 bold'),bg='#1f1f1f',fg='white')
        self.loadingScreen.pack(pady=20)
        self.loadModules()
        self.fadeAndResize(master)
    def loadModules(self):
        for i in moduleImportList:
            root.update()
            exec(i)
            print('module loaded')
    def fadeAndResize(self, master):
        initHeight, initWidth = master.winfo_height(),master.winfo_width()
        for i in range(200):
            Nwidth = initWidth + (800-initWidth)/200*(i+1)
            Nheight = initHeight + (500-initHeight)/200*(i+1)
            master.geometry("{}x{}".format(round(Nwidth),round(Nheight)))
            root.update()
        
root = tk.Tk()
mainWindow = mainGUI(root)
root.mainloop()

(also if there's a way for it to resize about the middle of the screen that would be nice too)

Edit: After viewing a bunch of other posts, I have come to the conclusion that messing around with transparency would not get me anywhere, so the next thing I can think of is to change the colors of everything within a frame to be the same as the background so it's virtually indistinguishable or to have some sort of canvas etc covering everything else, not sure how to implement that tho.