tetris_1.kv

<TetrisGame>:
    FloatLayout:
        size: self.parent.width, self.parent.height
        canvas:
            Rectangle:
                source: 'img/bg.jpg'
                size: self.size
            Rectangle:
                source: 'img/bg2.jpg'
                pos: 20, 20
                size: self.width/20*12, self.height-40

    Label:
        font_size: 70
        font_name: 'font/font.ttf'
        center_x: root.width / 20 *16
        color: [1,0,0,1]
        top: root.top
        text: "TETRIS"