<MainScreen>:
    BoxLayout:
        orientation: "vertical"
        ScrollView:
            do_scroll_x: False
            do_scroll_y: True
            Label:
                id: scroll
                size_hint: None, None  # très important !
                size: self.texture_size
                height: self.size[1]
                width: self.size[0]
                padding: 10, 10
                text: root.text
                color: 1, 0, 0.5, 1
                font_size: "20dp"