See the accepted answer in this post: http://apple.stackexchange.com/questions/3374/how-do-you-position-your-hand-to-use-the-command-key-what-finger-do-you-use
What's the markdown the person used to turn the CMD curly symbol in to a floating key like that? I see those used all over stackexchange sites but there's no mention of how to do that in the markdown editing help page.