Change desktop navigation background colour when open

Hi, I have a Navigation with dropdowns, and I really need to change the background colour of the navigation top area to white and swap the logo (swap SVG from white one to black) and change the dropdown link colour when it opens. Also so, it functions properly once closed from the existing dropdown or any other dropdown or clicking in the nav area (that seems to be webflow functionally to close the nav as well)

Any help would be much appreciated on this; I’m totally stuck!

Live link:

Read only link: Webflow - BMS Progress)