Is it possible to implement icons?

Hello, is it possible to implement icons with buttons? My site https://www.infoparrot.com/free-tattoo-fonts-for-body-tattoos-tattoo-writing-fonts/ where i already am using Forget About Shortcode Buttons plugin to create buttons. But since i also would like to use color box, and this plugin provides both – it would be realy helpful if there are any ways to implement custom icons in the button.

https://www.ads-software.com/plugins/standout-color-boxes-and-buttons/