如何在tkinter中更改matplotlib工具栏的颜色？

import tkinter as tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk
from matplotlib.figure import Figure

def change_toolbar_color(toolbar, color):
    for widget in toolbar.winfo_children():
        widget.configure(bg=color)

root = tk.Tk()

# 创建Matplotlib图表
fig = Figure(figsize=(5, 4), dpi=100)
ax = fig.add_subplot(111)
ax.plot([1, 2, 3, 4], [10, 20, 25, 30])

# 将图表嵌入到Tkinter窗口
canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)

# 添加工具栏
toolbar = NavigationToolbar2Tk(canvas, root)
toolbar.update()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)

# 更改工具栏颜色
change_toolbar_color(toolbar, 'lightblue')

root.mainloop()