[class^="icon-"], [class*=" icon-"] {
  font-family: 'mail-hearth';
  font-style: normal;
  font-weight: normal;

  /* fix buttons height */
  line-height: 1em;

  /* you can be more comfortable with increased icons size */
  /* font-size: 120%; */
}

.icon-mail { *zoom: expression( this.runtimeStyle['zoom'] = '1', this.innerHTML = ' '); }
.icon-heart { *zoom: expression( this.runtimeStyle['zoom'] = '1', this.innerHTML = ' '); }
.icon-heart-empty { *zoom: expression( this.runtimeStyle['zoom'] = '1', this.innerHTML = ' '); }
.icon-mail-alt { *zoom: expression( this.runtimeStyle['zoom'] = '1', this.innerHTML = ' '); }
.icon-mail-squared { *zoom: expression( this.runtimeStyle['zoom'] = '1', this.innerHTML = ' '); }