@keyframes loadingfadein {
	0% {
		opacity: 0;
	}
	100% {
		opacity: 0.5;
	}
}

._dash-loading-callback {
  font-family: sans-serif;
  padding-top: 50px;
  color: rgb(90, 90, 90);
  
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  cursor: progress;

  opacity: 0;
  background-color: rgb(250, 250, 250);
  /* Delay animation by 1s to prevent flashing 
     and smoothly transition the animation over 0.5s 
   */
  -moz-animation: loadingfadein 0.5s ease-in 1s forwards; /* Firefox */
  -webkit-animation: loadingfadein 0.5s ease-in 1s forwards; /* Safari and Chrome */
  -o-animation: loadingfadein 0.5s ease-in 1s forwards; /* Opera */
	animation: loadingfadein 0.5s ease-in 1s forwards;
}