How can I change the feature content headers?

I have the Lato google fonts being imported and would like that to be the font universally, however, I am still getting sans-serif as the feature content headers, newsletter header, blog header and all other headers used throughout the site. Any idea how to change this?

 

Hello,
Could you please share us your website link so that we can give you the exact solution.

 

sure, www.soundsleepinstitute.com

 

Hello,

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Note: Paste it just at the top.

Code:

@import url(http://fonts.googleapis.com/css?family=Lato);
h1, h2, h3, h4, h5, h6 {
font-family:Lato!important;
}