body, html{
  width: 100%;
  height: 100%;
  margin: 0;
  background-color: #1f1f1f;
}
svg {
  display: block;
}
/***** HOVER *****/
.name {
  display: none;
}
.circle:hover, .circle:active {
  fill: #122f3f;
  cursor: pointer;
}
.group-node:hover .name {
  display: block;
}