Python tkinter password app

import tkinter
#username and password are admin

root = tkinter.Tk()
root.title("Login")
root.geometry("200x200")

def wrong():
    msg = "Username or password is incorrect"
    lbl_display["text"]=msg



def login():
    user = txt_input_user.get()
    password = txt_input_pass.get()
    correct = "Welcome"
    if user =="admin":
        if password =="admin":
            lbl_display["text"]=correct
        else:
            wrong()
    else:
        wrong()
    txt_input_user.delete(0, "end")
    txt_input_pass.delete(0, "end")









lbl_display_user = tkinter.Label(root, text="Username")
lbl_display_user.pack()

txt_input_user = tkinter.Entry(root, width=15)
txt_input_user.pack()

lbl_display_pass = tkinter.Label(root, text="Password")
lbl_display_pass.pack()

txt_input_pass = tkinter.Entry(root, width=15)
txt_input_pass.pack()

btn_login = tkinter.Button(root, text="Login", fg="green", command=login)
btn_login.pack()

lbl_display = tkinter.Label(root, text="", fg="red")
lbl_display.pack()

btn_exit = tkinter.Button(root, text="Exit", fg="red", command=exit)
btn_exit.pack()













root.mainloop()