Build a Technical Documentation Page - Left side

HTML-CSS
1

Tell us what’s happening:
Could anyone help me how to form the left side?
I have no idea how to make that border and i don’t know what to do with the links

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0.

Link to the challenge:

2

You can give something like

border-right: 1px solid black;

to give border to the rightside of your navbar.