Icons in Callouts not showing up.

Hello – I’m using the Aegaeus 3.0 theme and want to show a Font Awesome icon inside of a button of a CallOut.

I’m using the following short code but I can’t get the icon to show up.

[callout size=”col-12″ last_column=”true” title=”Thank You for visiting this site” description=”I congratulate you on taking the first step in moving to a healthier & cleaner lifestyle.” button_title=”Download Catalog” button_link=”#” button_color=”red” button_size=”xlarge” button_rounded=”false” button_icon=”icon_download” button_in_new_tab=”true” flip_right_edge=”true”]

~ Jorge