.loading {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 9999;
  width: 100%;
  height: 100%;
  background: #fff;
}
.loading.hidden {
  animation: fade 2s ease 0s 1 forwards;
}

@keyframes fade {
  0% {
    opacity: 1;
    z-index: 9999;
  }
  99% {
    opacity: 0;
  }
  100% {
    opacity: 0;
    display: none;
    visibility: hidden;
    z-index: -1;
  }
}