Support for Night Mode

# Bug report

## Describe the bug

<img width="464" alt="image" src="https://user-images.githubusercontent.com/36251325/223781209-1caf1550-e0c4-48b7-b8fb-bc2537464f53.png">

## Expected behaviour

> Text to be white

## Anki/OS versions

- OS: macOS
- Anki version: 2.1.51

## Additional context

Let me know if you want me to open an MR for this.
