Hmm? When you say margins, what do you mean exactly?

Semi-randomly selected page follows:

https://aiengineeringfromscratch.com/lesson.html?path=phases...

Seems like there are at least two..

I get that there is no pleasing everyone, but geez.

edit:

Speaking of design, to author:

What is it built on?

I know we should nitpick designs too mich here but the right on that page should share some margin with the landing page...