section
  p.one one UbuntuBold (normal font-face)
  p.two two UbuntuMonoItalic (bold font-face)

  

@font-face {
  font-family: 'DroidSerif';
  src: url('https://rawgit.com/google/fonts/master/ufl/ubuntu/Ubuntu-Bold.ttf') format('truetype');
  font-weight: normal;
  font-style: normal;
}
@font-face {
  font-family: 'DroidSerif';
  src: url('https://rawgit.com/google/fonts/master/ufl/ubuntumono/UbuntuMono-Italic.ttf') format('truetype');
  font-weight: bold;
  font-style: normal;
}


section{
  padding: 2em;
  font-family: 'DroidSerif';
  .two{
    font-weight:bold;
  }
}