topfenbaecker wrote:However, I would like to do it in the proper way (change skinny.css), but pivotx_essentials.css overrides skinny.css
As far as I can see this is not true. As essentials is defined first in the header and then style.css belonging to skinny any definitions within style should overrule the ones in essentials.
Are you sure you coded them exactly the same (or even more specific)?
If you are unsure what exactly belongs to an element class-wise install a debug program (Firebug or Webdeveloper) that can help you deduce what string of classes is active for the element you want to style.
Quality is in the detail of things............
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