Small coding for website

Hello,

I am designing a website for a meditation centre and using Generatepress Wordpress theme with Elementor Pro page builder.
I have created a sticky header that has two menu items and the logo in white...however, when I scroll down the page I'd like the sticky header to turn white (this has already been accomplished) and for the menu items and logo to turn grey so they are visible. I opened a support ticket with Elementor and they said this would need to be coded in css.

Looking for help for this small job.
Thank you!
Chandra