[Velocd]

I already said you can fix it via the Admin Control Panel. If you're the administrator of your site, you really ought to learn how to at least navigate and use the AdminCP.

From the AdminCP go to Styles & Templates -> Style Manager -> find your style and click the GO button -> scroll down and look at the different CSS bits. Make checks to see if the colors match. If the style was coded half decent, the creator would have done all style changes in CSS, and not hard code them into the templates. Otherwise, you'll need to check the templates (e.g. who's online template).