I just watched a tutorial on responsive web design but I am confused about something. The content I have on my desktop viewer should carry through to the three other viewers, but one element is missing. It is a white line which I have imported in as a png. It shows on the desktop viewer but its missing in the three other viewers. Now when I try and replace it in the tablet viewer it carrys through to the mobile landscape & portrait viewer, but it also shows it in the desktop viewer. This is what I am confused about, as it states in the tutorial that if you design anything on any of the viewers it doesn't migrate back towards the desktop viewer. Please advise!