I've had a continual issue with exporting Illustrator documents and getting a border around the artwork.
See image attached.
The artboard is 1080 x 1080 pixels. I created a background box filled with pink colour at 1080 x 1080 pixels, placed all the contents, then created a clipping mask using a 1080 x 1080 square shape. All aligned to artboard. The left hand side has no gap but the right hand side has a small gap (as you can see from this png) and I can't work out how to get rid of this?