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

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

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

/*.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}
*/
.node {
  font: 10px sans-serif;
}

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

Comment out CSS which conflicts with Circle Packing CSS
Comment out CSS which conflicts with Circle Packing CSS