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Many CSS developers coming from standard web application development are used to targeting CSS rules to elements based on the element's ID. With portlets your content could be included multiple times on the page or other portlets on the page could have conflicting IDs. The solution for the conflicting ID problem with portlets is to use a unique namespace string provided by the portlet API. The problem this then presents for CSS is that the IDs for the elements are not static. The recommendation then is to only ever target CSS rules for portlets by class name and never by ID.
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On your local and dev instance, you can permanently disable JavaScript and CSS aggregation by adding to your .bash_profile: export JAVA_OPTS="$JAVA_OPTS -Dorg.jasig.resourceserver.utils.aggr.aggregated_theme=false” |