body {
  background: #222;
}
svg {
  max-width: 100%;
  margin: 0 auto;
  display: block;
}
.line {
  stroke-dasharray: 10;
  animation: dash 5s linear infinite;
  stroke: DeepPink;
  stroke-width: 1px;
}
.line-alt {
  stroke: DarkMagenta;
}

@keyframes dash {
  from {
    stroke-dashoffset: 120;
  }
  to {
    stroke-dashoffset: 0;
  }
}