Quick Recommendation
Looking at the source of your forum pages, it seems that the CSS styles are present in the HTML head of each page. If you stick these in an external css file, then reference it in the header, as shown below, then the file can be cached by the browser, which, especially on a high page view/user site like a forum can save you lots of bandwidth.
<link rel="stylesheet" type="text/css" href="external.css" />
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