Hi! Thanks very much, this solves the problem of boxes within boxes!

However, the total content of a single page still displays as a box on the page. Even if I don’t use the page builder. It used to be invisible, the line between the content and the background wasn’t visible.
The blog page is a goog example of that: http://pineonline.nl/blog/
The blogs are displayed as boxes, separating them from each other. The boxes take in room when viewed on a mobile screen, making the area that text is displayed in smaller and so text columns narrower.

Is there a way to fix this too?

Thanks!