Changing font-family for H1 tag

I want to make the font-family different for H1 tags... well what I really want is for the post/page titles to have a different font... but here is what I did:

In css.php I changed the following:

h1 { font-size: 34px; line-height: 1.2; margin: 0.3em 0 10px; font-family: "Copperplate Gothic Light", Arial, sans-serif; }

However I do not see a difference on the site:http://www.naturallyfitfood.com/

Any ideas???