Not sure if I followed NormanUKs guidance above correctly:
1. I copy and pasted the code provided to the "css/override.css' in template "gk_league_news". Specifically, I added the code to the bottom of the code that was already in place, two spaces below the last line which reads /* Here you can include your override CSS styles */.
2. After that, I changed the gk_league_news - Default settings in Template Manager (advanced settings) from "off" to "on".
When I viewed the site after these two steps, I noticed no change to the background image at all.
Not sure if I was supposed to add the new code to the top of the code already in place or below it, or somewhere withing the text of the existing code. Or, replace the code/text that was already there. So, I just put it on the bottom.
I should also mention that the width of my current background artwork (apart from the length) is a bit short and does not extend to the full lengths of the left and right boundaries of the page which leaves visible a blue background underneath as a result. About this, my instinct is to re-do the artwork with different width dimensions, at least.
www.americanfootballfilms.orgThanks NormanUK for your post.