The background color of the inline editor's CC lanes uses the "MIDI editor ruler background" theme element, but the CC lane names and the lane dividers don't follow "MIDI editor ruler text" color, or any other theme element that I could find.
By default, the CC lane names and the lane dividers seem to be darker shades of the background color. This works fine when using light colored themes, but when dark themes are used, the CC lane names and lane dividers are difficult or impossible to distinguish.