#ajax-preload {
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: 5010;
  width: 100%;
  background: #000;
  opacity: 0.6;
  display:block;
}

#ajax_preload_img {
  position: relative;
  left: 50%;
  top: 50%;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;
  z-index: 5011;
}