from tkinter import *

#Login GUI
window = Tk()
window.title("Countries Generation")
window.geometry("400x300")
window.configure(bg="#cccccc")

username = "admin"
password = "secret"

def callback():
        if (usertitle == username) and (passtitle == password):
            message.configure(text = "Valid Logged in.")
        else:
            message.configure(text = "Username and password don't match. \nPlease try again.")

title1 = Label(window, text="Log in", bg="#6491ca")
usertitle = Label(window, text="---Username---", bg="#6491ca")
passtitle = Label(window, text="---Password---", bg="#6491ca")
message = Label(window, bg="#6491ca")

user = Entry(window)
passw = Entry(window, show='*')

go = Button(window, text="Log in!", command = callback, bg="#3e3365")

title1.pack()
usertitle.pack()
user.pack()
passtitle.pack()
passw.pack()
go.pack()
message.pack()

window.mainloop()