I'm trying to hide the app icon from the title bar in GNOME in Ubuntu 18.04. I know there is this question asking the same thing but it's from 2011 and I can't find what it requires to find in the shell css. I'm also using the Arc-Dark custom theme.
Here are two examples of what I want to remove:
To be clear, I don't want to resize it to fit, I want to straight away remove it completely.