Unfortunately I can't tell you exactly what to change, I suggest you contact your skin developer and either point them to this CSS template (or copy it to them) and they will be able to advise you further.
While we try to make our products compatible with 3rd party skins out of the box, sometimes this is not possible. In such cases, we can only point people towards the area in which they need to make customisations, as we do not have the resources to assist every customer with every customisation.