In reviewing your file, what you are seeing is not a border, it is the transparent background (which I realize you have turned off)
if you turn that background back on, and change the color & transparency, you can see what I mean.
In reviewing your file, what you are seeing is not a border, it is the transparent background (which I realize you have turned off)
if you turn that background back on, and change the color & transparency, you can see what I mean.