Adjust size of custom icons in Academic's featurette

Is there a way to adjust the size of custom icons in the featurette widget of Academic? I added three custom icons and their size is very small. I’m developing the website completely in github: GitHub - koenraadvanmeerbeek/Website

It’s probably best to check out the wowchemy forums first for this. Academic is based on this very specific framework and they have support there: