[Python] Kivy showing a black screen when trying to use kv file?

So I want to do the styling of my Kivy app in a external .kv file, but when I run the main code, nothing appears to the black Kivy window.

Here's my main file called main.py

import kivy
from kivy.app import App
from kivy.uix.widget import Widget

class MyGrid(Widget):
pass

class MyApp(App):
def build(self):
return MyGrid()

if __name__ == '__main__':
MyApp().run()


And here's the .kv file located in the same directory and called my.kv

#:kivy 2.0.0
<MyGrid>:
Label:
text: "example example"


So I'm not getting any error, just nothing appearing in the Kivy GUI when I run the main code.

Why is this and how to fix it?

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