Help With Custom Fonts in 7.1

Site URL: http://www.beardallegiance.com

Trying to use custom sites throughout the site, however they seem to be applied to only certain areas throughout. Is there a list of all the changes I’ll need to make when entering Custom CSS? Besides “h1, h2, h3, h4, p,” etc? 

Hi. You can use this code to make entire custom font

* {
    font-family: mailston !important;
}