[Locked] Background with Ren'py (SOLVED)

EDIT SOLVED!! I got a bit bored so I thought I might give a crack at making a VN and i chose to do it with Ren'py.

I can get backgrounds in fine

But ...
they are either too small or too zoomed in...

how do i change this...
is there a command term to type in so it auto adjusts to the size of the image I want as the background (if that makes sense)
Or is there a certain resolution the image has to be in order for it to fill up the window?

Thank you in advance

EDIT
SOLVED
800 x 600 - easily done low tech on paint - sorry