can't figure out the name of the face

[Jai Dayal]

I am using the ujelly theme via the terminal. If I have the window split,
the active window shows the file-name in bright white colors. If the window
isn't active, then it shows the file name in the mode line (?) in a grey
color. The problem is that it's almost the same grey as the background,
thus making it very difficult to see when it's not active.

I simply want to change the color of the text that displays the file-name
in the mode-line of a non-active buffer, however, I have no idea what this
face is called.

Any suggestions?

Thanks,
Jai