Build a Technical Documentation Page error

HTML-CSS
1

Tell us what’s happening:
Where is the mistakes?

https://codepen.io/at_rbh/pen/wEZENb

Someone help me Please…

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36.

Link to the challenge:

2

Which error? Your project is passing all the tests.