更改弹出窗口Kivy的颜色

from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.button import Button

class MyPopup(Popup):
    pass

MyPopup.background_color = (1, 0, 0, 1)  # 设置背景颜色为红色

<MyPopup>:
    title: 'My Popup'
    size_hint: None, None
    size: 200, 200
    auto_dismiss: False
    background_color: 1, 0, 0, 1  # 设置背景颜色为红色

class MyApp(App):
    def build(self):
        button = Button(text='Open Popup', on_release=self.show_popup)
        return button

    def show_popup(self, _):
        popup = MyPopup()
        popup.open()

MyApp().run()