How to use
Module Class Suffix is a parameter in Joomla! modules. Setting this parameter causes Joomla! to either add a new CSS class or modify the existing CSS class for the div element for this specific module.
To use a module variation, just enter one of the following suffixes in the Module Class Suffix field of the module parameters:
mod_dark
mod_green
mod_orange
mod_red
mod_purple
mod_yellow
Heads up! Make sure that you enter the suffix with a leading space otherwise the module styling will not be applied correctly.
Extra suffixes
no-padding
Use this suffix in a module to apply a padding of 0 pixels.
no-margin
Use this suffix in a module to apply a margin of 0 pixels.
formatModule
Use this suffix to apply the default module style to a module in a spotlight position.
padding15
Use this suffix to apply a padding of 15 pixels to a module in a sidebar position.
grey-bg
Use this suffix in a menu item or module to apply a grey color as background color.
dark-bg
Use this suffix in a menu item or module to apply a dark grey color as background color.