main #milestones p a[href$=".pdf"]:before {
    content: "";
    display: none;
    margin-right: .2em;
    background: url(/images/icons/pdf-icon-small.gif);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: contain;
    width: 15px;
    height: 15px;
}