Sidebar Styling (Pin and Search icons)

[GarrettCh]

With Washington release Theme Builder got updated to allow users to configure components and confirm they conform to branding styling. With this I believed that I would be able to determine what controls Sidebar discussion styling. Unfortunately this was not the case. I am wondering if anyone has come across the correct property, theme page, or CSS styling page that controls the Sidebar discussion pin and search icons. After branding with Theme Builder they both seem to have taken on the styling of the background making them invisible. Highlighting works for the pin, but not the search (screenshots attached). During troubleshooting I was able to determine the CSS class that the component follows.