To the edge and beyond!
If you want to have your artwork (or background color) extend to the edge of the paper, it’s necessary to set up the print file with a “bleed.” That means if the final print size will be 8.5 x 11, for instance, then the file will be printed on a larger size sheet of paper and trimmed.
If you are printing the document or file on a desktop printer, you will have an unprinted area along the edge of the page. If you don’t want that unprinted border, it’s best to have your print piece set up by a professional graphic designer. Or…integrate the border as a creative aspect of your design. Again, the services of a graphic designer in this instance are helpful.