Matplotlib pyqt导航工具栏更改“图形选项”的背景色

import matplotlib.pyplot as plt
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar

fig, ax = plt.subplots()
# 在此处添加绘图代码

from PyQt5 import QtWidgets

app = QtWidgets.QApplication([])
window = QtWidgets.QMainWindow()
canvas = FigureCanvas(fig)
toolbar = NavigationToolbar(canvas, window)
window.setCentralWidget(canvas)
window.addToolBar(toolbar)
window.show()
app.exec_()

toolbar.setStyleSheet("QToolBar{background-color: red;}")