like here I insert in the custom CSS following lines
@import url(https://fonts.googleapis.com/css?family=Lobster);
.grid {font-family: 'Droid Sans', sans-serif !important;}
I also try
.site-name {font-family: font-family: 'Droid Sans', sans-serif !important;}
It is explained by tech55541 and Herbert van-Vliet similar, but why does it not work?
sorry for not showing the concerned url, the site is only available if I workes on it, so 99% the htacess is linking it to the old content.