r2c_mapd3js/styles/styles.css

.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}

.nodes text {
  -webkit-user-select: none!important;
     -moz-user-select: none!important;
      -ms-user-select: none!important;
          user-select: none!important;
  cursor: -webkit-grab;
   cursor: grab;
}