Rp Tutorials

Ok, guys. I KNOW I posted this question before (i think with a different journal) and I can't find it in ANY of the tags that I think they would be under.

Obviously, other people use Google Fonts that you don't have in your journal code. How do you make it so that it doesn't show up as Comic Sans? Cause what doesn't look so big as a size 20 in one font is HUGE in Comic Sans and let's just face it. None of us want to look at that shiz. HELP PLEASE! With a cherry on top!