yellow letter margin issues....

[Mubasher Riaz]

so this is my final draft of the yellow letter im going to be sending out with mail merge and all however notice when i print it out, theres the white area around the letter that shows up, now the yellow letter itself is 8.5 by 11.75 not sure how big the printing paper is but does anyone know how to adjust this issue in microsoft word? so when i print it, the white area disappears and I just get all yellow, thank you so much!