.edge {
  fill: red;
  stroke: red;
  stroke-width: 1.5px;
}

.edge.good {
  fill: green;
  stroke: green;
  stroke-width: 4px;
}

#chart {
  margin-left: auto;
  margin-right: auto;
}

body {
  overflow: hidden;
  margin: 0;
  font: 20px "Helvetica";
}

svg {
  width: 500px;
  height: 500px;
  margin-left: auto;
  margin-right: auto;
}

#chart, #header {
  position: absolute;
  top: 0;
}

rect {
  fill: none;
  pointer-events: all;
}

line {
  stroke: #000;
  stroke-width: 1.5px;
}