Build a Technical Documentation Page fixed position

HTML-CSS
1

I got most of my code in place but my fixed box of content is rolling over my main content. If I make My main document relative it covers my fixed content. I’ve looked online and youtube I haven’t found an answer. So anyone had this problem and fixed it.

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:

3

I’m looking to have my anchor list on the left with my main content on the right. With the list fixed to be seen
At all times while viewing the page.