Hi, it’s me again 🙁
it doesn’t work.
Defaut Font is “sans serif arial”
My Additional CSS:
#hgroup-wrap, #hgroup,  { padding: 0; }
.site {
    width: 100%;
margin-top: 0px;
}
@font-face {
  font-family: 'Oswald';
  font-style: normal;
  font-weight: 400;
  src: local('Oswald Regular'), local('Oswald-Regular'), url(https://fonts.gstatic.com/s/oswald/v12/DgBpgaYycijFA8v2hNt7MfesZW2xOQ-xsNqO47m55DA.woff2) format('woff2');
  unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
#access {
    font-family: 'Oswald', sans-serif;
}
In dev module of firefox, it told me : Arial system for menu item
If I change defaut font of the theme by Oswald,
All the site are change and firefox told me in police inpector of the item :
Oswald regular distance
with the same code you write :@font-face {….}
except : http://fonts.gstatic.com/s/oswald/v12/pEobIV_lL25TKBpqVI_a2w.woff2) 
I have test it, but without succes 🙁
any idea ?