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

<!DOCTYPE html>
<html>
<head>
  <style>/**
 * This work is licensed under the Creative Commons
 * Attribution 3.0 Unported License. To view a copy
 * of this license, visit http://creativecommons.org/licenses/by/3.0/.
 *
 * Author: Girish Sharma <scrapmachines@gmail.com>
 */

/* Demo specific styles begin */

* {margin: 0; padding: 0;}
body { 
  background: #eee;
}
.loader-3d {
  top: calc(50% - 12.5px);
  left: calc(50% - 100px);
  position: absolute !important;
}
/* Demo specific styles end */

.loader-3d, .loader-3d:before, .loader-3d:after {
  width: 200px;
  height: 40px;
  background: no-repeat;
  background-image: radial-gradient(closest-side, #111 100%, transparent), radial-gradient(closest-side, #111 100%, transparent);
  background-size: 20px 20px, 20px 20px;
  background-position: 0% center, 100% center;
  position: absolute;
  transform: translateZ(0);
  animation: slide 1.5s cubic-bezier(.5,0,.5,1) infinite, zoom ease-out .75s infinite alternate;
  content: '';
}
.loader-3d {
  animation-delay: .5s;
}
.loader-3d:after {
  animation-delay: 1s;
}

@keyframes slide {
  to {
    background-position: 100%, 0;
  }
}

@keyframes zoom {
  to {
    background-size: 40px 40px, 10px 10px;
  }
}</style>
</head>
<body>
  <div class="loader-3d"></div>
  <script></script>
</body>
</html>