Embedded docs theme styling issue

[MarconLP]

Bug description

How to reproduce

1. Open the app
2. Open the embedded docs
3. Switch between light & dark mode

Additional context

https://posthoghelp.zendesk.com/agent/tickets/10555

Thank you for your bug report – we love squashing them!

[corywatilo]

Would relate to colors of the website and code snippet not being in sync, I'd guess relating to the system's color preference?