@media screen {
  a[href$='.pdf']:before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    background: transparent URL('/wp-content/uploads/2017/08/PDF.png') center left no-repeat;
    width: 32px;
    height: 32px;
    margin: 0px 6px 0px 0px;
  }

  a[href$='.doc']:before, a[href$='.docx']:before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    background: transparent URL('/wp-content/uploads/2017/08/Microsoft-Word-2010-icon.png') center left no-repeat;
    width: 32px;
    height: 32px;
    margin: 0px 6px 0px 0px;
  }

  a[href$='.xls']:before, a[href$='.xlsx']:before {
    content: '';
    display: inline-block;
    vertical-align: middle;
    background: transparent URL('/wp-content/uploads/2017/08/Microsoft-Excel-2010-icon.png') center left no-repeat;
    width: 32px;
    height: 32px;
    margin: 0px 6px 0px 0px;
  }
}