path {
  stroke: #ff0000;
  stroke-width: 2;
  stroke-dasharray: 10000;
  stroke-dashoffset: 10000;
  fill-opacity: 0;
}

body {
  background: url(https://pixabay.com/static/uploads/photo/2015/02/21/09/57/heart-644091_960_720.png);
}