This is a method I came up with for smooth scrolling that solves the edge problem so you don't need any black border outline. First make edges the color of the backdrop (just for reference) then make another costume and use the clear fill (the little slash line). Within those bounds is where you will draw your backgrounds. Finally, Set the X and Y Index first and change the costume to the clear edged version after.
@MabonBaladevaKain (Me) You can also do this by changing size of the sprite to large enough to create boundaries and then setting the index and then changing the size back to normal size. A better method here: https://scratch.mit.edu/projects/195460338/
