Shopify custom work - Expert required

Hello,

Please check this video: https://www.veed.io/view/bc3f48b3-fcb7-4a79-be79-17d8564343ff
Website link: https://www.madameprovence.com/collections/maison-cuisine

You see our header offers different colors with different collections.

=> We want that when click on any link of the naviguation menu or any link on the footer, the header KEEP SAME COLOR (so it does not go back to WHITE by default as you can see in the video).

One idea was to duplicate each page 4 times and change header color each time but if you can do this fast with clean code, please contact us.

What is your best price for this first project ?

Thanks
Basically, the header BG color has to be different for each collection when click any links.

So if I am on collection 4 (blue) and I click any links from the naviguation menu, then it will redirect me to a page containing same header BG color = blue.

If I am on collection 3 (pink), then if click on any item from nav menu it will redirect me to the page with the header bg color in pink.

Etc ...

Price: 20$

Thanks