I am trying to create a new portal via site publisher. I created the center portal page. However, it looks like there is a grey border surrounding the portal page area(There is left, right and bottom border but no upper border). How can I get rid of these three borders? It makes the screen so ugly.
Furthermore, in the example acme portal, it looks like there is a grey background color on the screen. Please tell me how to make that?
I also attached a screen capture of this issue for reference.