@font-face {
  font-family: 'Helvetica';
  src: url('font/HelveticaNeueLTStd-Bd.woff') format('woff'), /* Modern Browsers */
       url('font/HelveticaNeueLTStd-Bd.ttf')  format('truetype'); /* Legacy iOS */
       
  font-style:   normal;
  font-weight:  600;
}

@font-face {
  font-family: 'Helvetica';
  src: url('font/HelveticaNeueLTStd-Md.woff') format('woff'), /* Modern Browsers */
       url('font/HelveticaNeueLTStd-Md.ttf')  format('truetype'); /* Legacy iOS */
       
  font-style:   normal;
  font-weight:  400;
}

@font-face {
  font-family: 'Helvetica';
  src: url('font/HelveticaNeueLTStd-Lt.woff') format('woff'), /* Modern Browsers */
       url('font/HelveticaNeueLTStd-Lt.ttf')  format('truetype'); /* Legacy iOS */
       
  font-style:   normal;
  font-weight:  200;
}