#links-graph {
  width: 100%;
  height: 600px;
  position: relative;
  background: #fff;
}

.links-tooltip {
  position: absolute;
  background: rgba(0, 0, 0, 0.85);
  color: #fff;
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 13px;
  pointer-events: none;
  display: none;
  z-index: 10;
  white-space: nowrap;
}