Anyway, I'm going to copy and past this persons instructions along with the line that needs to be deleted from your background. Hope this all makes sense.
(edited to say) apparently I can't add html coding, so if you want to know what line to delete, make a comment with your email or contact info, and I will send you that part and delete your email address.
That part needs to be deleted. Can't remember the terms for it, but ds says this set of instructions matches what this blogger did to her blog, not what most bloggers do. Everything else is correct. If this still doesn't help you, please make a comment and I will send you my own html coding that ds did and hopefully that should work.