How to validate a phpbb style?

[url]http://validator.w3.org/check?uri=http%3A%2F%2Fwww.drysnot.com%2Fforums&charset=%28detect+automatically%29&doctype=Inline&group=0[/url]

I am using a style that is not valid and I would like to know what file/files I need to try and edit to make it valid.

Thanks so much for the help.

My forums are here [url]http://www.drysnot.com/forums[/url]

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