iOS Smart Invert with dark mode not working

Darkluplite in dark mode when using iOS’s accessibility feature “Smart Invert” does not work correctly.

Steps to reproduce:
1. Go to https://darklup.com/ on an iOS device
2. Set the floating toggle switch to dark mode
3. Enable Smart Invert (https://9to5mac.com/2017/06/09/ios-11-dark-mode-smart-invert-colors-how-to-enable/)
4. You’ll note that the website is inverted to appear as a light mode (as expected with Smart Invert when dark mode is set) and quickly changes inverted light mode.

The page I need help with: [log in to see the link]