Steps:

1. Set up your browser to use dark mode
2. Open a book that you're currently reading
3. Click the button to add your progress ("Track progress" button for a newly started book; pencil icon for a book where you've previously tracked progress)
4. Open the Pages dropdown

Result - The dropdown has white text on a white background.

Expected - The background of the dropdown is dark to match the theme

Notes:

• I saw this in Chrome (version 109.0.5414.75) on Windows 10
• This only appears to affect the browser app. It looks great on my Android device.