#block-sociallinks-2 ul.social-links li.linkedin a {
    display: block;
    padding-top: 23px;
    width: 23px;
    height: 0;
    overflow: hidden;
    background: red;
    text-indent: -9999px;
    background: url(/themes/ncpa/images/icon-linkedin.svg) no-repeat center center;
    background-size: 23px;
}

#block-sociallinks ul.social-links li.linkedin a {
    display: block;
    padding-top: 18px;
    width: 18px;
    height: 0;
    overflow: hidden;
    background: red;
    text-indent: -9999px;
    background: url(/themes/ncpa/images/icon-linkedin.svg) no-repeat center center;
}