The icons are
img tags wrapped in anchors. To my knowledge there is no way to override an
img and still had the link clickable.
The easy way to change the icons is to replace the image itself. There are found in this folder:
Create the necessary size variations and overwrite the existing files. Make sure to force refresh your browser after doing this otherwise the browser will use the locally cached image instead of the new image when displaying the page.
The downside is that you’ll have to do this after each update to Connections.
Hope that helps!