How to add a menu class suffix in Joomla?
Use the Joomla menu class suffix to add a unique CSS style to the menu item and grab the attention of users. In this short tutorial, we’ll show you how to add the menu class suffix in Joomla.
Log in to Joomla ➝ click Menus ➝ open menu item ➝ switch to tab Link Type ➝ enter class suffix in the field Link Class ➝ click the button Save.

Open the custom CSS file of your Joomla template to add a custom CSS style or use the Gridbox Code Editor.