<!doctype html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.8/d3.min.js" type="text/JavaScript"></script>
    <style>
      .grid {
        stroke: #9A8B7A;
        stroke-width: 1px;
        fill: #CF7D1C;
      }
      .arc {
        stroke: #9A8B7A;
        fill: none;
      }
      .node {
        fill: #EBD8C1;
        stroke: #9A8B7A;
        stroke-width: 1px;
      }
      circle.active {
        fill: #FE9922;
      }
      path.active {
        stroke: #FE9922;
 