kivy/examples/kv/app_fbo.kv

#:kivy 1.0

Widget:
    canvas:
        Fbo:
            size: (200, 200)
        Color:
            rgba: (0.7, 0.3, 0.5, 0.7)
        Rectangle:
            size: (200, 200)
            pos: (200, 200)