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№ 2 in this link might be useful to you.
https://www.msofficeforums.com/word/...ge-colors.html
If you have no text on the page(s) that you want to add a background colour, then ignore the part which shows how to wrap/send behind text.
You can format/change the colours, gradient, transparency, add textures, use pictures etc as you please on the divider pages you have.