Okay thanks

ipad

So laptop or pc

computer, it has a rectangular screen.
.
here are the shapes of the canvas for different devices:
phone - slim verticle rectangle, tall anime post
tablet - wider verticle rectangle, the most common shape for animes
laptop - short horizontal rectangle, a pretty uncommon anime shape
PC - any shape
certain phones - any shape
smart fridge - square

I just realised this was done on a different device, what was it?