impress/app/assets/stylesheets/fonts.css.erb

/* A font by Jos Buivenga (exljbris) -> www.exljbris.nl */
@font-face {
  font-family: Delicious;
  src: local("Delicious"), url("<%= font_path "Delicious-Roman.otf" %>");
}

@font-face {
  font-family: Delicious;
  font-weight: bold;
  src: local("Delicious"), url("<%= font_path "Delicious-Bold.otf" %>");
}

@font-face {
  font-family: Delicious;
  font-style: italic;
  src: local("Delicious"), url("<%= font_path "Delicious-Italic.otf" %>");
}