.pkp_site_name::after {
  background-image: url(your-URL-here);
  background-repeat: no-repeat;
  margin-left: 0;
  margin: 0;
  position: absolute;
  top:75%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.2vw;
  padding: 0;
  content: "Open Access Journal of Philosophy | Açık Erişimli Felsefe Dergisi";
  white-space: pre;
}