Change the color of each element/word in the website header

Dear Sir/Ms.;

I hope you are doing fine

I need your help and your assistance please as I use education academia theme to build my website and I need to change something in the main navigation bar in the header

I need to set a unique color for each word/link in the navigation bar , for example, I need to make “home” link in red color, “about us” link in green color, “services ” link in blue color, ex,,,

I tried to edit in the html code and the CSS code but unfortunately it did not work.

So I need your urgent assistance, please

I will be waiting for your reply.

Thank you

The page I need help with: [log in to see the link]