I am using the Cards Region, to generate the following

I want to increase the size of the icons and the coloured circles they sit in.
I thought it would be as simple as changing the class details for the icon to 'fa fa-map-o fa-2x' AS CARD_ICON but that doesnt seem to have any impact. I also tried to add it as a second option to the Icon CSS Classes but that is also not impacting the size of the icon

Any ideas on how to increase the icon and colour circle sizes?
Application Express 20.2.0.00.20