How can I change the font size of a postheader

[heldentheater 0]

I would like to change the fonts size of the post titles healdines on that page: http://schaefergruppe.com/home/ I tried with CSS rules h2, h2.entry-title { font-size: 1.5em; } but nothing worked.

[Kate 3]

Please try this instead:

.fpost .post-title h2 {
	    font-size: 1.5em;
	}