body.index, body.about {
  background: url('/images/background-shades.png') no-repeat top center #faf4f1;

  .feature p {
    margin-top: 1.5em;
  }

  .getting-started {
    h2.sub {
      color: #F23818;
      padding-top: 70px;
      border-top: 1px dotted #E5DBD6;
      font-size: 19px;
    }
  }

  p.prose {
    width: 800px;
  }

  .section.gears {
    margin-top: 70px;
  }
}

body.index, body.about {
  background: no-repeat top center #faf4f1;
  background-image: url('/images/background-shades.png');
  background-image: url('/images/background-shades.svg'), none; // See: http://css-tricks.com/svg-fallbacks/

  .feature p {
    margin-top: 1.5em;
  }

  .getting-started {
    h2.sub {
      color: #F23818;
      padding-top: 70px;
      border-top: 1px dotted #E5DBD6;
      font-size: 19px;
    }
  }

  p.prose {
    width: 800px;
  }

  .section.gears {
    margin-top: 70px;
  }
}

Use SVG version of background shades if browser supports
Use SVG version of background shades if browser supports
