.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}
.node-path circle {
    stroke: steelblue;
    stroke-width: 2.5px;    
}

.node {
  font: 12px sans-serif;
}

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

.link-path{
  fill: none;
  stroke: steelblue;
  stroke-width: 2.5px;
}