.loader {
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: .90;
}

.loader > img {
  width: 60px;
}

.loader.hidden {
  animation: fadeOut 1s;
  animation-fill-mode: forwards;
}

@keyframes fadeOut {
  100% {
      opacity: 0;
      visibility: hidden;
  }
}