anchor.diff:    }
     .root_node text {
       stroke: #176E9B;
  +    fill: #176E9B;
       font: 20px sans-serif;
     }
  -</style>
  +/*  .postcode_node text {
  +    text-anchor: right;
  +  }
  +*/</style>
   
   <script type="text/javascript">
   
  
positive.code:         root;
  
      var force = d3.layout.force()
          .linkDistance(80)
          .charge(-120)
          .gravity(.05)
          .size([width, height])
          .on("tick", tick);
  
negative.code: 
      function color(d) {
        if (d.root_node == true) {
          return "#C2DEFC";
        }
        if (d.view_node == true) {
          return "#fd8d3c";
  