I thought it would be `:focus` or `:active`, but it does not seem to be the case.

I got rid of the dotted border by setting `outline:none;`, but if click and drag off one of the buttons so that it turns orange and then press tab the newly active element does not get styled like I thought it should.

[JSFiddle](http://jsfiddle.net/bh9ah/1/)

How can I style the element that is normally outlined in a dotted outline in Firefox?