body {
  background-color: white;
  margin: 0;
  overflow: hidden; }

rect {
  fill-opacity: 0.2;
  stroke-opacity: 0.7; }
  rect:nth-last-child(-n + 4) {
    fill-opacity: 0.5; }

.voronoi path {
  fill: none;
  stroke: black; }

.triangles path {
  fill: none;
  stroke: red;
  stroke-width: 2; }