Updated the background again. Compared to last week, the day/night areas no longer extended forever into the edge. I thought it looked weird since there would be extra space on the sides that you can’t actually fill (because of the 5 card limit). This looks even worse on something like an iPhone 6 that’s even longer. It doesn’t matter on an iPad since it cuts the last card a little bit.
What’s next: testing and maybe more UI design.