Err, can you link me to a page where this happens? Why would things be "overspilling"? Do you have some really wide tables entered somewhere?
ETA: Nevermind, I know what you mean. The fact that a scroll bar appears when a page is long is default browser behavior. Without the scroll bar, how would your users get to the content?
The only thing you can do, is add the below to your css, so that ALL pages, even short ones, have a scroll bar.
html { min-height: 100%; margin-bottom: 1px; }
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