Broken joomla website due rokgzipper, fixing required

Hi, Our joomla template/website got broken due to the reason that we have enabled rokgzipper plugin. Now even if we disable it, website works fine in firefox, but not in safari or chrome. Found out that rt-backgroud rt-hidden could cause it as firefox gets different css and it all works there beautifully. Needed a quick fix plus after that making sure the website is well optimised for speed. Url by PM.