Feature Request: Expose Default CSS for Play Area Preview

The biggest reason I have stuck with Ink is that simple yet extremely helpful play area which lets me read and judge the pacing of the story without all the markdown.

I wonder if there's any exisitng way or if anyone else think it's worth having the default Play Area CSS exposed for editing so that we can apply some quick styling to the classes we have written down?

What I would love to do is apply some basic text-transfom and alignment to make it look more like a screenplay, which is the format I'm used to.

If I need to recompile each time I changed the styling that would be a bit cumbersome.

Start at the Play Area Preview and trace how its default CSS is provided and how styling changes currently require recompilation. Determine where that CSS can be exposed for editing; done means users can apply basic text transformations, alignment, and other class styling without recompiling each change.

Written by the indexing model from the issue text.