[Python] Login window center

I'm totally new to python and Tkinter and trying to make a login window that leads to another page, if the right username and password are submited. Works pretty well, but the window is not centered, tried everything but nothing works, it doesn't move at all.

This is my code, I hope some1 can help

class logInWindow(tk.Frame):

def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)

self.configure(bg='white')

header = ttk.Label(
self,
text="SRH-WIP",
anchor="center",
style="Header.TLabel"
)

# Footer als TTK-Label
bottom = ttk.Label(
self,
style="Footer.TLabel"
)

# TTK Style
style = ttk.Style()
style.configure("Header.TLabel", foreground='white', background='#DF4807', font=("Inter", 50, 'bold'))
style.configure("Footer.TLabel", background='#D9D9D9')

# login button
def login():
username = "Jack"
password = "12345"
if username_entry.get() == username and password_entry.get() == password:
#messagebox.showinfo(title="Erfolgreich", message="Anmeldung erfolgreich")
controller.show_frame(mainPage) # Zeige die MainPage, wenn Login erfolgreich
else:
messagebox.showinfo(title="Fehler", message="Passwort oder Benutzername falsch")

login_frame = tk.Frame(self, bg='white')

# create Anmelde Widget
login_label = tk.Label(login_frame, text="", bg='white', font=("Inter", 23, 'bold'))
username_label = tk.Label(login_frame, text="Benutzername", bg='white', font=("Inter", 19))
username_entry = tk.Entry(login_frame, bg='white', font=("Inter", 15))
password_entry = tk.Entry(login_frame, show="*", bg='white', font=("Inter", 15))
password_label = tk.Label(login_frame, text="Passwort ", bg='white', font=("Inter", 19))
login_button = tk.Button(
login_frame, text="Login", bg='#081424', fg='white', font=("Inter", 20, 'bold'), command=login)

# place on screen Anmelde Widget
login_label.grid(row=5, column=1, columnspan=3, sticky="", padx=40, pady=40)
username_label.grid(row=6, column=1)
username_entry.grid(row=7, column=1, padx=30, pady=10)
password_label.grid(row=8, column=1)
password_entry.grid(row=9, column=1, padx=30, pady=10)
login_button.grid(row=10, column=0, columnspan=2, padx=40, pady=30)


# Platziere Header und Footer relativ zur Fenstergröße
header.place(relx=0, rely=0, relwidth=1, relheight=0.1)
bottom.place(relx=0, rely=0.85, relwidth=1,
relheight=0.13)

login_frame.grid(row=1, column=0)


I tried:

# Widgets in der Mitte zentrieren
login_label.grid(row=0, column=0, columnspan=3, sticky="nsew", padx=40, pady=(40, 10))
username_label.grid(row=1, column=0, sticky="nsew")
username_entry.grid(row=2, column=0, padx=30, pady=10, sticky="nsew")
password_label.grid(row=3, column=0, sticky="nsew")
password_entry.grid(row=4, column=0, padx=30, pady=10, sticky="nsew")
login_button.grid(row=5, column=0, padx=40, pady=30, sticky="nsew")


# create Anmelde Widget
login_label = tk.Label(login_frame, text="", bg='white', font=("Inter", 23, 'bold'))
username_label = tk.Label(login_frame, text="Benutzername", bg='white', font=("Inter", 19))
username_entry = tk.Entry(login_frame, bg='white', font=("Inter", 15))
password_label = tk.Label(login_frame, text="Passwort", bg='white', font=("Inter", 19))
password_entry = tk.Entry(login_frame, show="*", bg='white', font=("Inter", 15))
login_button = tk.Button(
login_frame, text="Login", bg='#081424', fg='white', font=("Inter", 20, 'bold'), command=login)

# place on screen Anmelde Widget
login_label.grid(row=0, column=0, columnspan=3, sticky="nsew", padx=40, pady=(40, 10))
username_label.grid(row=1, column=0, sticky="nsew")
username_entry.grid(row=2, column=0, padx=30, pady=10, sticky="nsew")
password_label.grid(row=3, column=0, sticky="nsew")
password_entry.grid(row=4, column=0, padx=30, pady=10, sticky="nsew")
login_button.grid(row=5, column=0, padx=40, pady=30, sticky="nsew")

login_frame.grid_rowconfigure(0, weight=1) # Für den login_label
login_frame.grid_rowconfigure(1, weight=1) # Für den username_label
login_frame.grid_rowconfigure(2, weight=1) # Für den username_entry
login_frame.grid_rowconfigure(3, weight=1) # Für den password_label
login_frame.grid_rowconfigure(4, weight=1) # Für den password_entry
login_frame.grid_rowconfigure(5, weight=1) # Für den login_button

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