/*
  started from: 
    Collapsible Radial Reingold-Tilford
      http://jsfiddle.net/Nivaldo/CbGh2/
*/
.CRRT {
  z-index:4; 
  position:absolute; top:0; right:0;
  width:300; height:300; 
  background-color:lightgreen;
}
.node {
  cursor: pointer;
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.node text {
  font: 10px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}