Totally random question about css

We have v3.6.0 live as of a few minutes ago. I’ve customized the colors
to match our company scheme but have found a section that doesn’t have
color but seems as if it should.

The section is the queue headers that list the column headers selected
to be displayed. If I recall correctly, it should have some color but
is instead just white. Where would I set the color for this?

Mathew Snyder