Background image question

In wordpress - Is there a way to make my background image cover the whole page? I am using a template that calls the <php get_header();?> and footer. It’s working but of course it is not loading in my header and footer. Do I have to cut the image up and load part of it in the header, middle and footer?

I’m so sorry, I figured it out. I was thinking there had to be an easier way to do it. For others who might need help I went into the css file and under the body section I simply added background:url(‘pathtoimage.jpg’);

worked like a charm. Now I just have to figure out how to load a different background image for each page.