Mozilla Developer Network is your one-stop shop for detailed information on CSS properties.

Use Codepen or jsFiddle to provide working code samples.

/r/snippit can be used to post/use little snippets of code.

Techniques differ a lot between formal CSS development and subreddit stylesheets, so you'll often get better answers there.

/r/csshelp and /r/reddithax are the places to go for questions relating to Reddit's stylesheets.

Inspire, a collection of all kinds of useful links.

I won't enforce this, but it'd be nice if you'd follow it.

Try to use descriptive titles (not 'I have a question.').

Don't use link shorteners (bit.ly for example), because they are automatically marked as spam.

It might be old news to you, but they wouldn't ask if they hadn't already sought an answer, and there might be other people too afraid to ask for themselves.

If someone posts their work here and you don't like it, give them objective feedback about ways to improve it, not 'it's ugly.' Likewise, CSS newbies often have the same questions as they grow and learn, so try not to be mean when they post a question we've seen a thousand times before. If your CSS helps sell your product, great, but make sure your post is about the CSS, not the product. This reddit is a place to learn and show off CSS, not sell your products. In other words, feel free to post something like 'Isn't my 404 page neat?' with a link, but avoid posts like 'Hey look how cool my site is!' that link to a storefront. If you've developed a neat CSS trick that you want to share with others, make sure you share the trick, not your website.

If you need help with styling your website or your reddit, or want to share a neat trick you cooked up, it's welcome here! For reddit-specific questions, you may also try /r/csshelp and /r/reddithax, but if a post is appropriate there, it's appropriate here, too. Here in /r/css, you've got a place on reddit to talk about CSS, whether you're new to CSS and want to learn, or a pro wanting to discuss the engineering and usability reasons that all modern browsers ignore CSS, short for Cascading Style Sheets, is used almost universally across the web to affect the design and appearance of every website you visit.

Materialize collapsible