First option is to select category with dropdown from predefined categories. Problem is its impossible to style that dropdown for custom styles because its behavior prevents dropdown from being inspected. I click dropdown and I see this:
I wanted to fix colors of "Example Category" in my style, to do that I need to find out what class it is so I could find entry in gallery css templates.
Problem is, as soon as I click on browser tools' inspection window, dropdown closes. As soon as browser window loses focus that dropdown closes.