This feature might have been requested before but I think it would be a great addition to add to Itch's already insane amounts of customizability. I think it would be great if we could fill or fit the big images like banners and backgrounds kind of like how windows handles them on their wallpaper settings (image attached).
This might skew the graphics at different monitor sizes and that's ok. I'd say it would be a nice option to have for those who are less savvy with custom CSS. Thanks!
edit: This was meant to go into the Ideas & Feedback section. Don't know why its in the tips category, sorry about that.