Technical Documentation Page - User Story #12

Hi,
I’m new to coding and I’ve tried to look through other threads to work out where I am going wrong but I’m still stuck. I’ve changed my headings to a simple one through to five to ensure my spelling and case is right. I have 5 nav-links and 5 sections with 5 id’s. What am I missing?

I have worked out that it didn’t like a style in the CSS:
#navbar {visibility: collapse; }
I had this in there to enable a hamburger menu. Why did it affect the test?