Thread:Project:Support desk/hide main page title

hi how can I hide the main page title for http://pt-br.random-wikisaur.tk because when I use this code for common.css

body.page-Main_Page h1.firstHeading { display:none; }

it doesent work but it works on my English one at http://en.random-wikisaur.tk but wont work for my other page. it says on one of the pages on mediawiki that it wont work in mediawiki 1.22 or 23 I think it is the same common.css code for both my wikis please can I have some help

and please add this code

body.page-Main_Page h1.firstHeading { display:none; }

back to mediawiki so we can use it please