The correct forum for Afterburner would be the Free Joomla Stuff forum. I will move it.
You can create a file using a simple text editor for custom css and name it using this format: templatefolder-custom.css (e.g., rt_afterburner2-custom.css). For this issue add this to the custom CSS file#rt-header {background-color: #8ED0C4;}
More Info here:
www.gantry-framework.org/documentation/j...custom_stylesheet.md