"19. Relative Positioning" - I think this needs to be updated
I think there is misinformation in this section: "19. Relative Positioning". I'm not sure how to contact the website owners, but here's what I think is wrong...
In this section "Relative positioning", the notes and instructions reference "margin-top" and "margin-left", but I believe they meant to say "top" and "left". By coincidence, using margin-left works in the example, but it's not what they meant for the student to use, as it does not interact with the actual relative positioning setting.
I'm referring to these instructions below (as well as the notes above them on the page):
Give it a try: change #inner's position to relative and give it a margin-left of 200px.