main a[href$=".pdf"]::before {
  content: "";
  display: inline-block;
  margin-right: .2em;
  background: url('/images/icons/pdf-icon-small.gif');
    background-position-x: 0%;
    background-position-y: 0%;
    background-repeat: repeat;
    background-size: auto;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: contain;
  width: 15px;
  height: 15px;
}