I didn't look at your html, but typically styles like that use some kind of <table> "wrapper" around their content to make it look nice. It's that html table code you'd replace in ppopen.tmpl and ppclose.tmpl.
I don't have time to look at it right now - family coming over for the holiday - but I will try over the weekend if I can to see what code your site might be using.
Please do not PM me for support or sales questions. Thank you for your understanding.