How to center buttons in Kivy?
<p>I am new to Python UI programming, and I am trying out Kivy. I want to center some buttons on my screen, but the buttons do not move from the bottom right of the window. I was wondering if anyone could point out what I am doing wrong or am missing?</p>

<p>vgx.kv:</p>

<pre><code>#:kivy 1.9.1

&lt;VgxMainScreen&gt;:
    BoxLayout:
        size_hint: 0.2,0.2
        size: 200, 100
        orientation: 'vertical'

        Button:
            text: 'Game Select'
        Button:
            text: 'Options'
        Button:
            text: 'Controllers'

&lt;VgxUI&gt;:
    AnchorLayout:
        anchor_x: 'center'
        VgxMainScreen:
            size_hint: 0.2,0.2

&lt;VgxApp&gt;:
    FloatLayout:
        VgxUI:
            center: 0.5, 0.5
</code></pre>

<p>VgxApp.py:</p>

<pre><code>import kivy
from kivy.app import App
from kivy.uix.widget import Widget
kivy.require('1.9.1')

class VgxMainScreen(Widget):
    pass

class VgxUI(Widget):
    pass

class VgxApp(App):
    def build(self):
        return VgxUI()

if __name__ == '__main__':
    VgxApp().run()
</code></pre>