Node red how to change the nodered dashboard layout fonts

In nodered I have used the theme-tomorrow which I have got in node red forum. But in nodered flow editor having dashboard layout font color I have to change. In the below snap I have shared it has the property --nr-db-dark-text:#444 it is working but which file I have to modify. I tried to add the style :root { --nr-db-dark-text: #444; --nr-db-light-text: #eeeeee; --nr-db-disabled-text: #999; } in theme-tomorrow CSS file but it is not overriding.


By changing ui_base.html I configured the above css properties.