如何在循环中动态改变tkinter按钮的颜色？

import tkinter as tk

def change_color(button, colors, index):
    button.config(bg=colors[index % len(colors)])
    index += 1
    button.after(1000, change_color, button, colors, index)

root = tk.Tk()

button = tk.Button(root, text="Click Me", width=10, height=2)
button.pack()

colors = ["red", "green", "blue", "yellow"]
index = 0
change_color(button, colors, index)

root.mainloop()