I can't read my def ratings with the light background vs the blue background that is easy to read on off ratings.

Which screen is this an issue on? Do you have a screenshot? Could help to see the issue for the devs to potentially fix in a future update.

I'm not sure what cshort1970 is referring to, but on the player cards, the small text right below "Offensive Proficiencies" and "Defensive Proficiencies" indicating each type of sets/strategy is hard to read since it's a very light gray on the black background.

The same is true for the small text above the circular/pie charts for both Offense and Defense screens for Strategy.