Example: https://gist.github.com/tkanarsky/8858d339f02567d5cd25fcf9c4...
It was pretty tricky finding the right selectors to use as the UI is just full of React div-soup with zero semantic meaning. I eventually settled on some CSS classes that work well for now, but that might change at any time in the future. No guarantee of stability :)
One thing it's missing right now is code highlighting -- I haven't had the time to translate the language names from hljs -> markdown.