Build a Technical Documentation Page re-coding my page

HTML-CSS
1

the result screen is blank. none of my HTML is showing.

Chrome

User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36.

Link to the challenge:

2

It’s because you are giving

margin: 100%; to the body.

What are you trying to do with this style?