Embeded Content Font Color

Hi,
I love this theme and it has great font color options and operability. I am having one issue, however, with this font in my map markers:
Site: https://artdeco.org/decony
Click on one of the markers and a you will see the text is very light grey and not legible. I cannot find where this font is controlled in the theme styles.
Can you help me target this font color?
Thanks,
Rosannah