hide.py

from kivy.base import runTouchApp
from kivy.lang import Builder

KV = '''
#:import Animation kivy.animation.Animation
FloatLayout:
    BoxLayout:
        id: box
        orientation: 'vertical'
        size_hint: .4, .4
        center_x: root.center_x
        center_y: root.center_y

        Button:
            text: 'push me'
            on_press:
                (
                Animation(right=0, t='out_elastic') +
                Animation() +
                Animation(center_x=root.center_x, t='out_elastic')
                ).start(box)
'''

runTouchApp(Builder.load_string(KV))