Page.kv

#:kivy 1.10.0

<Page>:
    orientation: 'horizontal'

    canvas.before:
        Color:
			rgba: root.background_color
        Rectangle:
            pos: self.pos
            size: self.size
            texture: root.background_image

    Label:
        text: root.title
        color: root.text_color
        font_size: 20
        width: 25
        size_hint_x: None

        canvas.before:
            Color:
                rgba: root.tab_color
            Rectangle:
                pos: self.pos
                size: self.size

            Color:
                rgba: 1, 1, 1, 0.2
            Rectangle:
                pos: self.pos
                size: 1, self.height
            Rectangle:
                pos: self.x, self.y + self.height - 1
                size: self.width, 1

            Color:
                rgba: 0, 0, 0, 0.2
            Rectangle:
                pos: self.x + self.width - 1, self.y
                size: 1, self.height
            Rectangle:
                pos: self.pos
                size: self.width, 1

            PushMatrix
            Rotate:
                angle: 90
                origin: self.center

        canvas.after:
            PopMatrix