Medium - skeletons

skeleton.css

/* BASE SKELETON*/
.skeleton {
  display: inline-block;
  height: 1em;
  position: relative;
  overflow: hidden;
  background-color: #bdbdbd;
  border-radius: 2px;
}

/*SHIMMER EFFECT*/
.skeleton::after {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  transform: translateX(-100%);
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0,
    rgba(255, 255, 255, 0.2) 20%,
    rgba(255, 255, 255, 0.5) 60%,
    rgba(255, 255, 255, 0)
  );
  animation: shimmer 2s infinite;
  content: "";
}
@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

template.html

<div class="skeleton" style="height: 56px; width: 56px; border-radius: 50%; margin-right: 24px; margin-bottom: 24px;"></div>

<div class="skeleton" style="height: 32px; width: 80%; margin-bottom: 32px;"></div>

<div class="skeleton" style="height: 64px; width: 100%;"></div>