[SOLVED] Unable to change text styling in Atahualpa 3.4.1

Hi, I am very new to Atahualpa 3.4.1, just started using it today morning, and love it! I am faced with a few issues however:

1. Unable to change the content style for the <h1> tag here:
http://metricmine.com/blog/?page_id=12
The headers "db" and "etl" do not get styled - if I try to put the following in
# Overall Style & Config. | Body, Text & Links:
h1.about {
font-family: Haettenschweiler ;
}

Nothing happens. Any ideas will be very welcome. Not a CSS expert (thankfully, with Atahualpa, I don't need to be!).

Regards.