data/train/codepen-ABKVZX-AbRrvV/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-fb {
  top: calc(50% - 5px);
  left: calc(50% - 5px);
  position: absolute !important;
}
/* Demo specific styles end */

/* Loader with three blocks */
.loader-fb, .loader-fb:before, .loader-fb:after {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 50px;
  background-color: rgba(215,230,240,0.9);
  border: 1px solid rgb(215,230,240);
  z-index: 100000;
  content: ' ';
  margin-left: -5px;
  margin-right: -9px;
}
.loader-fb:before {
  top: -11px;
  left: -100%;
  animation: loading-fb .8s cubic-bezier(.4,.5,.6,1) infinite;
}
.loader-fb {
  animation: loading-fb-main .8s cubic-bezier(.4,.5,.6,1) .2s infinite;
}
.loader-fb:after {
  top: -11px;
  right: -100%;
  margin-top: 50%;
  animation: loading-fb .8s cubic-bezier(.4,.5,.6,1) .4s infinite;
}
@keyframes loading-fb {
  from {
    transform: scaleY(1.4);
    background-color: rgba(55,114,171,0.9);
    border: 1px solid rgb(55,114,171);
  }
}
@keyframes loading-fb-main {
  from {
    padding-top: 10px;
    padding-bottom: 10px;
    margin-top: -10px;
    background-color: rgba(55,114,171,0.9);
    border: 1px solid rgb(55,114,171);
  }
}</style>
</head>
<body>
  <div class="loader-fb"></div>  
  <script></script>
</body>
</html>