Hi,
I modded the standard blackcandy theme and if I look at the html page in a browser it looks fine with 0 top margin and header flush with the top of the browser, but when in silverstripe I get around a 20px gap above my header.
For some reason I had this happen to me trying to make a wordpress theme also, does anyone know anything in particular to stop this happening, it seems to be something that php powered sites seem to do to css or something, it is obvious that lots of people know how to avoid this, it seems so obvious to a lot of people that it is hard to find information on such a thing when googling. Either knowingly or unknowingly theme designers seem to put in a preventive measure to stop this from happening, what that measure is I would Love to know