This is already partially implemented into 2.2, but in 2.2 the templates CSS files are loaded before the integrations CSS is executed causing the integrations CSS to override the templates. You can work around this by just using !important if you don't care about IE6 and previous browser support (we're on IE9 so at this point IE6 shouldn't matter anymore). Next release will fix this by loading template CSS after integrations so template CSS files can override the integrations. To add an integration CSS to your template simply use the format of cbgroupjiveINTEGRATION.css and place it in your GJs template folder (e.g. cbgroupjivewall.css).