@keyframes progress {
  0% {
    background-position: -200px, 0;
  }
  100% {
    background-position: calc(200px + 100%), 0;
  }
}

.skeleton.v1 {
  box-sizing: border-box;
  background-color: #eee;
  background-image: linear-gradient(90deg, #eee, #f5f5f5, #eee);
  background-size: 200px 100%;
  background-repeat: no-repeat;
  display: inline-block;
  line-height: 1;
  width: 100%;
  animation: progress 1.2s ease-in-out infinite;
  height: 1rem;
}

@keyframes glow {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.skeleton.v2 {
  box-sizing: border-box;
  display: inline-block;
  background-color: #eee;
  color: transparent;
  width: 100%;
  height: 1rem;
  animation: glow 1.5s ease-in-out infinite;
  line-height: 1;
}