Cross-posting this from https://lemmy.ca/post/1271596 due to the current federation situation:
A new version of my Rediggit theme for Lemmy has dropped, and with it comes a name change...
Rediggit is now Lemonberry, to better reflect the separation from Reddit.
I've also added a much-requested dark mode, adapted from Lemmy's default darkly theme. Those familiar with the Reddit Enhancement Suite's dark mode should find this pretty comfortable.
The latest version of Lemonberry is optimized for Lemmy v0.18.1 only and is available on GitHub and UserStyles. I will likely keep the optimizations in sync with only the larger instances as Lemmy development is changing rapidly, and it's proving difficult to maintain compatibility with older versions.
You can also find older versions of the theme, and additional screenshots, at the GitHub repo.
If you have no idea what any of this means, Lemonberry is a flexible, full-width light and dark theme for Lemmy. It is just one of many user-made themes for this community. These themes can be installed and enabled with the use of a CSS injector browser add-on, such as Stylus (Firefox, Chrome). UserStyles.world is a good place to start exploring the available themes.
Cheers
No such feature exists yet on the desktop version, but I am sure it's on the wishlist already. Apps might be able to implement this themselves, but I can't say whether any have yet.
Edit: clarified