.skeleton {
  animation: fill 1.6s linear infinite;
  background-color: #fff;
  border-radius: 10px;
  border: 1px solid #fff;
}

@keyframes fill {
  0% {
    opacity: 0%;
  }
  
  50% {
    opacity: 62%;
  }
  
  100% {
    opacity: 0%;
  }
}