I am modifying the theme of Blender, and have most of the settings where I want them. However, I am having difficulty with a temporary message field, circled in yellow below.
I have messed around with every possible setting in the Info panel section of the Themes window:
...but none of them seem to affect this particular field.
Does anyone know the name of this field, and where I can change the display colors for it? The white text on light grey background is a bit difficult to see, even on my iMac's 5K Retina display.
Also, is there any good reference available where I can see exactly where each item in the Themes panel is used within the Blender interface?
In case you are curious, I am running macOS 10.14 Mojave beta in dark mode with the red accent color, as shown here:

