Question
Why is there a 1 px shadow around my 1px stroke on digital ads
Hi!
I am creating digital ads and I need to put a 1 px border around them. I used the marquee tool on a new layer to add a 1px black stroke but on some of the add there is like a shadow around it also 1 px and some of the other's the line is grey instead of black. Looks like this

Does anyone know what this is and how to fix it?
