data/train/codepen-ABKVZX-njwzKo/full.html

<!DOCTYPE html>
<html>
<head>
  <style>/* Demo specific style begin */
.loader-dots {
  position: absolute;
  top: calc(50% - 10px);
  left: calc(50% - 40px);
}
/* Demo specific style end */

.loader-dots:before, .loader-dots:after {
  height: 20px;
  width: 45px;
  background-image: radial-gradient(closest-side, #111 100%, transparent), radial-gradient(closest-side, #111 100%, transparent);
  background-position: 0%, 100%;
  background-size: 20px 20px, 20px 20px;
  background-repeat: no-repeat;
  position: absolute;
  animation-duration: 0.8s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-name: spin, onOff;
  content: '';
}

.loader-dots:before {
  animation-direction: normal, reverse;
}
.loader-dots:after {
  right: 0px;
  animation-direction: reverse, normal;
}

.loader-dots {
  height: 20px;
  width: 70px;
  background-image: radial-gradient(closest-side, #111 100%, transparent), radial-gradient(closest-side, #111 100%, transparent);
  background-position: 0%, 100%;
  background-size: 20px 20px, 20px 20px;
  background-repeat: no-repeat;
  position: absolute;
  animation: toggle 0.8s ease-in-out infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg)   }
   50% { transform: rotate(180deg) }
  100% { transform: rotate(180deg) }
}

@keyframes onOff {
    0% { opacity: 0; }
   49% { opacity: 0; }
   50% { opacity: 1; }
  100% { opacity: 1; }
}

@keyframes toggle {
  0%    { background-size: 0px 0px, 20px 20px }
  49.9% { background-size: 0px 0px, 20px 20px }
  50%   { background-size: 20px 20px, 0px 0px }
  100%  { background-size: 20px 20px, 0px 0px }
}
</style>
</head>
<body>
  <div class="loader-dots"></div>
  <script></script>
</body>
</html>