kv.kv

<Button>
    font_name: "images/CuteFont.ttf"
    font_size: 40
    size_hint: 1, .4
    background_color: (.157, .455, .753, 1)
    background_normal: ""
    background_down: ""
    canvas.before:
        Color:
            rgba: (0, 0, 0, 1)
        Line:
            width: 2
            rectangle: self.x, self.y, self.width, self.height

<ColoredLabel@Label>
    font_size: 30
    font_name: "images/Mogra.ttf"
    size_hint: .3, .15
    color: 0,0,0,1

Panel:
	slider: slider
	btn: btn
	
	canvas.before:
		Rectangle:
			pos: self.pos
			size: self.size
			source: "images/bg.jpg"

	Button:
		id: btn
		pos_hint: {"x": 0, "top": .4}
		text: "START"
		on_press:
			root.change_button()

	Slider:
		id: slider
		min: 2
		max: 200
		step: 1
		orientation: "horizontal"
		size_hint: 1, .1
		pos_hint: {"x": 0, "top": .9}

	ColoredLabel:
		pos_hint: {"x": .35, "top": .7}
		text: str(slider.value) + " CPS"