Where is this line located?

Hey guys. I’m using firebug on my site to edit my custom background image (mostly just the position),but when I got my image the way I wanted it I noticed that I wasn’t editing my css but my site’s page #8? does that make sense? I cant seem where to add the code in my style.css, because no matter where I enter this code
body.custom-background {
background-attachment: scroll;
background-image: url(“http://www.therecomplife.com/wp-content/uploads/2013/03/final.png”);
background-position: center top;
background-repeat: no-repeat;

It doesn’t appear on my site, although I did something a few hours ago to the css and It looked great on the home page…but the background image changed when I would go to different pages.