I'd like to create a theme with this layout http://i49.tinypic.com/2z6w7z5.jpg for the homepage. At the moment I am working off an already existing html website I am a confused about what the white and green/blue part of the layout should be named, i.e. what file name it should have.
Thus far I have the bottom footer and the light blue background set up, but am at a lost for what the body file should be (to get it centred with the white background).
Thank you in advance for any help.