#loader-overlay {
  position: fixed;
  inset: 0; /* top:0, right:0, bottom:0, left:0 */
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.75);
  z-index: 9999;
}

#loader-overlay img {
  width: 50%;
}