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When a portal page is loaded, the CSS stylesheets are loaded in the following order:
A style of a stylesheet can override the style of all the stylesheets loaded before. Therefore if a portlet body skin defines the following CSS class:
my-portlet-style-class { background-color: green; }
It can be customized by adding the following class in a custom module of the portal skin:
my-portlet-style-class { background-color: red; font-size: 1.2em; }
This new style definition changes the background color to red and defines the font size to 1.2em.
Inside each category, stylesheets are loaded following an order defined by the attribute css-priority for Portal and Portlet skin elements and the field Priority for ECMS site stylesheets. The stylesheets with lower priority value are loaded first.