Lessons truncated

Hello,


Picture is worth more than thousand words. It shows that output box is overflowing and invisible. It should be showing `world` on a dark background.

On really wide screens (in my case 2880px) the lessons get truncated. I'm getting this issue both in latest firefox and chromium.

Possible fix is to add max-width around sections with tutor comments.

Side note: font size on the page itself is way too small. I'd advise using at least 16 px for the important lesson information if possible.

Cheers,
Furai