.chart {
              display: block;
              margin: auto;
              margin-top: 60px;
              font-size: 11px;
            }

           .node {
  stroke: #009900;
  stroke-width: 1.5px;
  color: #009900;
 
}
 
 
.node text {
  pointer-events: none;
  font: 15px sans-serif;
  stroke-width: 0px;
}
 
.link {
  stroke: #999;
  /* stroke-opacity: 2.6; */
}
 
 
 
path.link {
  fill: none;
  stroke-width: 2px;
}
 
 
marker#end {
  fill: #999;
 
}
 
line {
  stroke: #000;
  stroke-width: 1.5px;
}