body {
  font-family: sans-serif;
}

.countries > path {
  opacity: 0.8;
  stroke: white;
  stroke-width: 0.3;
}

.countries > path:hover {
  opacity: 1;
  stroke: red;
  stroke-width: 1;
  z-index: 1;
}

svg {
  background-color: linen;
  cursor: move;
}

.tooltip {
  position: absolute;
  background: darkgreen;
  border-radius: 5px;
  color: white;
  opacity: 0; /* initially hidden */
  padding: 0.5rem;
  pointer-events: none;
}