Help passing technical Documentation Page tests

HTML-CSS
#1

I need help with passing test for Technical Documentation page

i have got an error for #4 and #12 not sure what I am doing wrong.

https://codepen.io/vishangsoni/pen/LgxVPV

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36.

Link to the challenge:

#2

You made a typo in one of your section’s id - it’s different than header’s text. Besides you use same id for two different elements (section and header) - this is not correct, id is unique.

Same story for nav-link.

I’ve seen at least 3 typos in your code, verify it.

#3

Thanks @wawraf. I have made typos with References section.

#4