Change Background Color of Dropdown Bubbles

Is there a way to change the background color of the dropdown bubbles?

On the main report, everything is in its own gray dropdown bubble, which is best for black text. However, when I run a report, the dropdown bubble is removed, leaving the text over a background color that varies with our color coding. In this case, white text is usually best since we use dark/bold colors.

If I could change the color of the dropdown bubbles, I could match them to the background or adjust the contrast. Unfortunately, I can't figure out how to do that. This results in black text that's hard to read on a dark background for the reports, or white text that's hard to read on the gray dropdown bubble for the spreadsheets.

We need to keep the rest of the formatting on the reports, so removing the formatting (or the dropdown bubbles) isn't a great option. Changing the color of the dropdown bubbles would be the simplest fix for me.

Answers