How can i change font size of a post?

Add this as custom css:

.entry { font-size: 18px; }

And adjust as you wish.

Hi…

How about if I want to change all font sizes? I try this code:

.entry.excerpt { font-size: 24px; }

but doesn’t work for post.

I’m having this problem as well, trying to change the font size of the excerpts on the main page.