It looks fine to me but try putting the following code in.
Before you do, where it says "background-color" change the color code to one close to your background image color.
Also make sure to save it by clicking Modify Style at the very bottom.
If you go back in and make any edits in the top section (the normal edit section) and save it up there, you may lose the changes you made earlier. Ive not quite gotten those two areas to work well togeher and find (for myself) its better to stick to one, or the other.
/* The main body of the entire forum. */
body
{
color: #000000;
background-color: #E6E6E6;
background-image: url(http://i137.photobucket.com/albums/q232/LaundryLady1947/Patriotic%20Themes/rose_cross_lg_wht_me.jpg);
font-size: small;
font-family: verdana, arial, helvetica, sans-serif;
margin: 1px;
padding: 12px 30px 4px 30px;
}