Is it possible to create a twitter like 'reply' or 'retweet buttons that appear on hover only using CSS?

I'm trying to create some buttons like this

;

They're inside a link with display block,开发者_开发技巧 and appear only on hover. How can i do this with css only?

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I guess the easiest way would be something like:

#thing{
display:none;
}

#thing:hover{
display:block;
}

You could put on your fancy-pants and add some transitions to gussy it up but then you couldn't use display:none;