Clean up styles

I've begun the work of making the implementation of style methods more uniform and correct, but this got to be so big that I decided to stop half-way.

This PR will represent "cleaning up" `arc` - `list_box` (using the list in #711).

I'll make lots of inline comments on what I considered "cleaning" and I'm eager to hear feedback.
Sometimes blank lines are ok, to separate two parts of a method.

Parentheses are optionally for most part and depend on your personal preference, mostly.

So yeah looks good.