#preloader {
  width: 100vw;
  height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -ms-flex-direction: row;
  flex-direction: row;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-animation: fade-in 5s infinite ease-in-out;
  animation: fade-in 5s infinite ease-in-out; }

@-webkit-keyframes fade-in {
  from {
    opacity: 0; }
  50% {
    opacity: 0.5; }
  to {
    opacity: 1; } }

@keyframes fade-in {
  from {
    opacity: 0; }
  50% {
    opacity: 0.5; }
  to {
    opacity: 1; } }