.siteNav li.nav-item:nth-child(7) {
    background-image: url(/caps/images/twitter.png);
    background-repeat: no-repeat;
    background-size: 38px;
    background-position-x: 7px;
    background-position-y: 3px;
}
.siteNav li.nav-item:nth-child(7) a,
.siteNav li.nav-item:nth-child(7) a:hover {
  color:#003764
}