Edit in JSFiddle

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body {
  background: #BFE6F1;
}

svg.grid-fw {
  width: 100%;
}

@keyframes offset {
  from {
    stroke-dashoffset: 4000;
  }
  to {
    stroke-dashoffset: 300;
  }
}
polyline {
  animation: offset 40s linear alternate infinite;
  animation-delay: 40s;
  -webkit-animation: offset 40s linear alternate infinite;
  -webkit-animation-delay: 0;
  stroke-dasharray: 500;
  stroke-dashoffset: 500;
  stroke: #b5e3f0;
  stroke: rgba(255, 255, 255, 0.25);
}