I am successfully displaying a VF page of a list of accounts in Communities.  It looks good when logged in as a System Administrator & a typical Salesforce user.  However, when I login with a Community license there is a dark grey box around the VF page.  I don't understand what is happening - why visually the colors on the page aren't the same.  Is there a right th user needs that he doesn't have?  I believe I tried adding all the possible rights to the user's profile & the problem isn't fixed.