What is this menu item called?

The little dialog that tells you info about the last edit you did, such as removing doubles… what is that called?

Specifically, what is it called in the Preferences > Themes menu?
I’ve made a custom theme, based off someone else’s custom theme, and the text is difficult to read, so I want to change the color of either the text or the background behind the text.

If anyone knows, please share.

Look in Info-> Theme Space Settings. The background is “Header”, you’ll figure out the rest.

Thank you!
I found the one for the text, which is specific to “Info”.
Still looking for the background one, which I suspect may be in one of the more general sections…