.preloader {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.5s ease;
}

.preloader.hidden {
  opacity: 0;
  pointer-events: none;
}