a#back-to-site-link {
  position: fixed;

  display: inline-block;
  bottom: 0;
  right: 0;
  padding: 8px;
  background-color: #000;
  color: #fff;
  opacity: 0.5;
  filter: alpha(opacity=50);
  text-decoration: none;
}

a#back-to-site-link:hover {
  color: #abc;
}