#loader {
  position: fixed;
  top:0;
  z-index: 13;
  display: none;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
}

#loader img {
  position: absolute;
  width: auto;
  top: 45%;
  left: 46%;
  top: calc(50% - 72px);
  left: calc(50% - 46px);
}