[Suggestion] Add button to change theme

[ghost]

Many browsers don't display the dark theme of GrimGrains by default.
I'd like to suggest adding a button which changes the theme using only CSS & HTML like how Invidious does it.

[neauoire]

It looks like Invidious uses javascript to handle the button event.

[ghost]

It looks like Invidious uses javascript to handle the button event.

It works when I have JavaScript disabled. I assumed they have something else doin’ it.