I’m working with this theme to test and the GR (Goodreads) Progress theme is white. With Spacious’s free default setup, the footer areas are dark gray which triggers a white font in the widget and makes it white font on a white background.
I’m going to contact the widget support as well, but am wondering if there is any CSS I can place for the theme to change the color in this specific widget to provide better contrast.
You can choose the style and color of the footer by going to Appearance > Customize > Footer > Footer Design and select the style between the two. If you want to change the footer color, you can add the additional CSS by going to Appearance > Customize > Additional CSS and insert the below-mentioned code.