I've been using CIVICRM for quite some time. But now, when I install it under a newer Rockettheme (Gantry 5) template (let's say Xenon), the civicrm.css file gets totally ingnored. If I use a joomla default template, then no problem.
The only workaround I have is not pretty... that is... copy all of the civicrm.css code into my custom.scss file.