If I place it into a module then its rendering context is being clipped by the Joomla styling structure. I want it to cover the whole client area of browser. I'm looking for any way to change this styling, that would be valid solely for On_line_App.html page. The rest of the pages in the web site must retain the original styling.
I found a guide on how to do that, but it's a bit complicated for the novices. Is there any easier way to accomplish this?