Snippets are available in Obsidian, however, finding snippets remain an elusive task. Snippets thus remain sidelined as a functionality particularly amongst the non-power users, although it has significant capabilities in customising one’s Obsidian user experience.
A snippets gallery that looks and work like the current community plugin marketplace or the theme marketplace should do the trick. Personally, I have a preference towards the look and feel of the community plugin marketplace, since that would allow for CSS magicians to state whether their snippets are dependent on a certain theme or another snippet.
Downloading CSS snippets off old forum posts, and Discord, and from far corners of the web. Unfortunately, all of which can get easily lost/misplaced, or requires someone more well-versed with Obsidian (and active on either platforms) to point someone the right direction.
None as far as the search function as I’ve used it detects.