Forum:How to make the search bar's background transparent?

I've just changed the background of the wiki transparent, but what CSS do I have to insert to make the background of the search bar in the top-right hand corner of the screen transparent? &mdash; [/wiki/User:Sam_Wang S a m ] [/wiki/Message_Wall:Sam_Wang W a n g ] 12:40, February 22, 2012 (UTC)