fix(themes) Standardize the padding/spacing for all themes

[joshgoebel]

It's very weird that 2-3 of our themes completely change the padding/text-layout. I understand why the "school paper" one does, but otherwise our themes should be consistent when it comes to whitespace.

This standardizes on:

  display: block;
  overflow-x: auto;
  padding: 0.5em;

Only 3 themes were changed to bring all our themes into alignment.

[joshgoebel]

@egor-rogov We have some themes that specify no BG color... that seems very weird to me... if they are intended to be light themes would it hurt to add white?

If they are actually intended to be transparent then I think we should specify that explicitly. Thoughts?

[joshgoebel]

Example of issue on our demo site... if it's intended to be transparent it's not obvious in demo so we'd have to think of a way to indicate that?

[egor-rogov]

Exactly what's stated in https://highlightjs.readthedocs.io/en/latest/style-guide.html

As for transparent backgrounds, I honestly have no idea.

[joshgoebel]

Exactly what's stated in https://highlightjs.readthedocs.io/en/latest/style-guide.html

Ha, convenient. :) I hadn't seen that.

As for transparent backgrounds, I honestly have no idea.

We'll solve that another day then.