Changing the background colour on product/collection pages with a certain tag?

Is there a way to force the background colour to override from the main theme if a product/collection has a certain tag? OR

I have created a different template for page, product, and collection and within the customise section I can modify blocks etc. Is there a way through coding or otherwise that I can also have a different colour scheme to the main theme colour scheme?

@Nicolle_Evans ,

share the url and screenshot too.

So this is a product page on my website: https://www.turtlecovers.co.uk/products/citroen-berlingo-van-2018-front-seat-covers

Is there a way to change the grey to a different colour depending on a product tag for example?