Google Photos has a really nice Dark Mode in the Mobile App, but the Googlers have forgotten the Web App. This is my implementation of a Dark Mode for Desktops.
With a so-called user styles, you can override the styles from the origin page within your browser. You are a single click away, to apply the Dark Mode to your Google Photos Web App.
Restyled everything, including search bards, settings, modals and cards.
If you want to report a bug or you have a feature request instead, fill an issue.