As it often happens, the solution was quick to find only after the question
was posted.
This works well:
*.register-cursor {
color: blanchedalmond;
}
Here is a gist that adjusts this for a dark theme (still can't add new urls
to the wiki):
A quick question in relation to GTK3 customization
(https://wiki.gnucash.org/wiki/GTK3).
I've applied an existing dark theme and that covers general GTK elements.
One issue I have now is that the selected/active register row keeps the dark
text but gets the dark background from the theme.
Does
