#loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  color: #fff;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s;
}

#loader.active {
  opacity: 1;
  visibility: visible;
}

.loader-spinner {
  font-size: 64px;
}