Modifying the Joomla template on your site is a breeze if you are using a template from (they have a few free ones for use as well.) This tutorial will show you how to easily change the CSS tags on your Rockettheme Joomla Template. Tools used in the tutorial are:

Gantry Template Bundle for Joomla 2.5 + 3.2 - found at:

And exTplorer file manager for Joomla found at:

ss editing css files in rockettheme templates