Greek Yogurt website size

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Hi, I am trying to adjudst the width size of the Greek Yogurt theme.

I have managed to extend it from 960px to 1050px, but the footer does not extend when I do this. I have a all black background footer so on the right side it stops at 960px and the rest it white. Can anyone advise me on how can I fix this?

Also the main content and sidebar content areas are in the same place as before I extended it. Is it possible to extend the content areas while keeping the same percentage difference in size?