It'd be really neat if you could choose the card and background colors yourself, instead of there only being some presets

It'd be nice if there were additional options for the card and background colors. With Amoled black, everything's black, but it'd be neat if there was an option for something like a black background and dark gray cards. Or even better, just an option to freely choose colors for both!

On my tablet, cards are too wide to be useful, especially if the post contains an image. An option to change the max card width (maybe a slider with a percentage setting?) would be useful.