Rhael Santos,
Just create a rectangle with the Rectangle Tool and give it the desired Fill Color and a Stroke of None, make it large enough to extend past the Artboard/artwork and send it to the back (Ctrl/Cmd+X+B).
Rhael Santos,
Just create a rectangle with the Rectangle Tool and give it the desired Fill Color and a Stroke of None, make it large enough to extend past the Artboard/artwork and send it to the back (Ctrl/Cmd+X+B).