.signature path {
  fill: none;
  stroke: #000000;
  stroke-width: 5px;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 3000;
  stroke-dashoffset: 3000px;
  stroke-opacity: 1;
  -webkit-animation: dash 5s linear infinite;
  animation: dash 5s linear infinite;
}

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

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