this post was submitted on 26 Feb 2026
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LemmyToday
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If you experience issues or problems with this instance (lemmy.today), this is the place to discuss them. Or if you just want to ask questions about how something works. Anything related to the instance or lemmy itself.
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If you want to tweak the appearance of a website via custom CSS (and optionally share it), there's the Firefox and Chrome extension Stylus.
https://addons.mozilla.org/en-US/firefox/addon/styl-us/
https://chromewebstore.google.com/detail/stylus/clngdbkpkpeebahjckkjfobafhncgmne
It's really intended for re-theming individual sites, though -- I don't think that it has a way to publish your CSS changes for lemmy.today's theme so that users of any other lemmy instance could automatically find them using Stylus, just manually import them. You could upload them somewhere
and it looks like some people have done so, as with this GitHub archive of Lemmy themes
but it doesn't natively provide a feature to "search for custom themes published for any Lemmy instance".
It allows multiple domains to be specified, and you can use regex to match domains that contain the word "Lemmy". And on userstyles.world or any other place you post your theme to, you can add "Lemmy" as a category so others can find it when using that as a search term.
Users of instances which don't have "Lemmy" in the domain name will have to modify it to add their instances though.