If you're just talking about the style for your forum and not some vBadvanced thing (I haven't messed with that stuff yet) just go to your AdminCP.
AdminCP > Styles and Templates > Style Manager > (select style) All Style Options.
That will allow you to change the CSS for your whole forum. I'd probably download your style to have an untouched copy. You could even then import that style that you just downloaded to have the default one and one to play with.
AdminCP > Styles and Templates > Download/Upload Styles.
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