Low contrast on Ncurses-like apps

[JoseExposito]

What Happened

When using applications based on Ncurses or a similar library, the contrast is really low. Examples are the kernel menuconfig or mutt (the email client).

Here is an screenshot of the kernel menuconfig running on VScode and Terminal:

Expected Behavior

Text should be readable by default.

Steps to Reproduce

Execute a Ncurses program.

Platform Information

elementary OS 6.