How to add to the menus

Hi all,

I’m using this Dropdown menu plugin for our new website.

I would like to have the selected item look bigger than other items in the list. Like shown in this fiddle – https://jsfiddle.net/zRtbZ/

How/where do I add <optgroup> & </optgroup> to the plugin’s code?

Is there a better way to make the selected item’s font size bigger than the rest?

Thanks.

https://www.ads-software.com/plugins/dropdown-menus/