'End extra' pages in different colour from cover

In Bloom Beta, we can change the background colour of the cover page, which is quite nice. But if we change the background colour on the cover page to blue, for example, the ‘End extra’ pages will also be blue. I do not yet use the ‘End extra’ pages much, but I think that if I were to use them (maybe for overflow of credits/attribution details if they don’t all fit), I’d prefer them to be white, rather than the same colour as the cover page, so it would be good to have a way to change that.
Thanks for considering.