shimmer.css

.shimmer-background {
  animation-duration: 1s;
  animation-fill-mode: forwards;
  animation-iteration-count: infinite;
  animation-name: placeHolderShimmer;
  animation-timing-function: linear;
  background: #f6f7f9;
  background-image: linear-gradient(to right, #f6f7f9 20%, #e9ebee 40%, #f6f7f9 60%, #f6f7f9 100%);
  background-repeat: no-repeat;
  background-size: 800px 100%;
}
@keyframes placeHolderShimmer {
  0% {
    background-position: -468px 0;
  }
  100% {
    background-position: 468px 0;
  }
}