Right now:

White is shown when you overscroll the page. It would look a lot nicer if we made the tag have a background of the header/footer so that the overscroll area is the same color.
Our header and footer colors are actually different them variables so they could be different. So we might need a different solution where there is some ::before or ::after content that's outside of the viewport that's the same color as the header and footer respectively.
This is obviously super low priority.