Nintex Newbie

Displaying Font Awesome Icons during Form Edit and Preview

On a form I'm designing, I'm using a Rich Text control with stacked Font Awesome icons to embellish the approval of a form. The font awesome CSS file is already being included site wide, however, I doesn't seem to come through during Form Edit and Preview:

I can work-around this with an @import in my Custom CSS to the font-awesome.css file, but I suspect this would end up @importing the font-awesome css twice -- once globally then again when the form is loaded.

Is there a way to have the font-awesome css render correctly during form edit and preview without having to explicitly import the css again?