This is the feature1 module position using default styling
This is the feature3 module position using default styling
This is the content-top2 module position usingĀ "box-color2" styling
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 -- Joomla Glossary
On the module variations page, several module classes are showcased. As you can see, multiple module classes can be added to a module to combine styles. If you want to use multiple suffices on one module, you have to separate the classes with spaces.
The module class suffix can be added in the 'Module parameter' (Module Manager > Your Module Name > Module Parameters > Module Class Suffix). Every style, label and icon can be mixed, leading up to 300 styles for your modules!
This is the left module position using "box3 box-color2 no-title-color" styling
This is the left module position using "box2 box-color1 pattern2 no-title-color" styling
This is the right module position using default styling