span.extendedmathchar {
    font-family: "STIXGeneral", serif;
}

i span.extendedmathchar,
em span.extendedmathchar {
    font-family: "STIXGeneralItalic", serif;
}

b span.extendedmathchar,
strong span.extendedmathchar {
    font-family: "STIXGeneralBol", serif;
}

b i span.extendedmathchar,
b em span.extendedmathchar,
strong i span.extendedmathchar,
strong em span.extendedmathchar,
i b span.extendedmathchar,
i strong span.extendedmathchar,
em b span.extendedmathchar,
em strong span.extendedmathchar {
   font-family: "STIXGeneralBolIta", serif; 
}

div.sottotitoletto h2.title span.extendedmathchar,
div.sottosottotitoletto h3.title span.extendedmathchar,
div.table p.title span.extendedmathchar,
table .tabellaintestazionenota span.extendedmathchar,
table .tabellaintestazionefonte span.extendedmathchar,
div.chaptermetainfo div.orgname span.extendedmathchar,
.bibliomixed .rifbiblio_content .citetitle span.extendedmathchar,
.biblioentry .rifbiblio_content .citetitle span.extendedmathchar,
.bibliomixed .rifbiblio_content .subtitle span.extendedmathchar, 
.biblioentry .rifbiblio_content .subtitle span.extendedmathchar,
.figuraintestazionenota span.extendedmathchar,
.figuraintestazionefonte span.extendedmathchar,
div.box .titolettobox h3.title span.extendedmathchar,
div.dedication_page div.dedication span.extendedmathchar,
div.dedication_page div.epigrafe span.extendedmathchar,
div.frontespizio_page div.frontespizio-subtitle span.extendedmathchar {
    font-family: "STIXGeneralItalic", serif;    
}

/* fonts (keep at bottom) */
@font-face {
  font-family: "STIXGeneral";
  font-style: normal;
  font-weight: normal;
  src: url(STIXGeneral.otf);
}

@font-face {
  font-family: "STIXGeneralItalic";
  font-weight: normal;
  font-style: italic;
  src: url(STIXGeneralItalic.otf);
}

@font-face {
  font-family: "STIXGeneralBol";
  font-weight: bold;
  font-style: normal;
  src: url(STIXGeneralBol.otf);
}

@font-face {
  font-family: "STIXGeneralBolIta";
  font-weight: bold;
  font-style: italic;
  src: url(STIXGeneralBolIta.otf);
}