Need help to hide a PAGE titel

Running latest WP and theme ver. at fleksjobbernetvaerket.dk Among other elements, I show a page (not post) on the frontpage of my site. i think the page id is 48. I only have a titel, and no other content on that page. But i dont wanna show the titel, so i have tried with the follow CSS .page-id-23 .entry-title { display: none; } ..... but that won't work