Thread:Manual talk:FAQ/Apostrophe in removing title

Hello, I've been having trouble trying to make use of "body.page-Main_Page.action-view h1.firstHeading, body.page-Main_Page.action-submit h1.firstHeading { display: none; }". I tried to replace "Main_Page" with another page, but the page in question has an apostrophe ('). How do I overcome this issue? Any reply will be much appreciated.