Help with Wordpress/ Thesis Fonts

I've got the font working correctly in the post titles here but when I open the post, the title isn't that same font. I would like it to be.
I added this to my custom css file

h1, h2, h3, h4, h5 { font-family: MuseoSlab-300; font-weight: normal; }
.headline_area { font-family: MuseoSlab-300; }

Code (markup):

I believe these are both h1 tags. Obviously something isn't right. Any clues?

 

They look the same to me.

 

Thank you. They still look different than me. I've F5'd and checked mozilla & chrome but I'm not seeing what you are seeing I guess.

 

I clicked thru to a post page, Firebugged it, and it came up with the following from your custom stylesheet:

.headline_area h1, .headline_area h2, .headline_area h2 a {
    font-family: MuseoSlab-300;
}

Code (markup):

 

I did that too but I can't seem to figure out what it should be.