@font-face {
  font-family: 'geometricslab703bt-xtrabold-opentype_bigfontsite.com';
  src: url('/path-to/geometricslab703bt-xtrabold-opentype_bigfontsite.com.woff2') format('woff2'),
       url('/path-to/geometricslab703bt-xtrabold-opentype_bigfontsite.com.woff') format('woff'),
       url('/path-to/geometricslab703bt-xtrabold-opentype_bigfontsite.com.ttf')  format('truetype');
}

body {
  font-family: 'geometricslab703bt-xtrabold-opentype_bigfontsite.com', sans-serif;
}