how to reference a font in an otf file by url code example

Example 1: font face

@font-face {
  font-family: myFirstFont;
  src: url(sansation_light.woff);
}

Example 2: @font-face rule in css

@font-face {
  font-family: "Open Sans";
  src: url("/fonts/OpenSans-Regular-webfont.woff2") format("woff2"),
       url("/fonts/OpenSans-Regular-webfont.woff") format("woff");
}