title: W3C Font-Family Parse error 'Open Sans', Helvetica, Arial, sans-serif;
body: <p>Why do I get an Parse error ( line 24 ) on this line of CSS? </p>
  
  <pre><code>font-family: 'Open Sans', Helvetica, Arial, sans-serif;
  </code></pre>
  
  <p>the full Code where I get this error is:</p>
  
  <pre><code>.btn {
    display: inline-block;
    *display: inline;
    /* IE7 inline-block hack */
    *zoom: 1;
      border:none;
      box-shadow: none;
      text-shadow: none;
      background: #212121;
      overflow: hidden;
      z-index: 1;
      font: inherit;
      display: inline-block;
      box-sizing: border-box;
      vertical-align: middle;
      line-height: 40px;
      min-height: 40px;
      font-size: 13px;
      text-decoration: none;
      text-align: center;
      padding: 0 33px;
      overflow: hidden;
      z-index: 1;
      font-family: 'Open Sans', Helvetica, Arial, sans-serif;
      font-weight: 300;
      text-transform: uppercase;
      letter-spacing: 0;
      -webkit-transition: all 0.15s ease-in-out;
      transition: all 0.15s ease-in-out;
      -webkit-backface-visibility: hidden;
  }
  </code></pre>