.tooltip {
  position: absolute;
  min-width: 50px;
  max-width: 250px;
  padding: 7px;
  pointer-events: none;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
  z-index: 1;
  -moz-box-shadow: 3px 3px 10px 0 rgba(0,0,0,.25);
  -webkit-box-shadow: 3px 3px 10px 0 rgba(0,0,0,.25);
  box-shadow: 3px 3px 10px 0 rgba(0,0,0,.25);
}

.counties>path {
  stroke: #fff;
  stroke-width: 1px;
  stroke-opacity: 0.9;
}

.counties>path:hover {
  fill-opacity: .7;
  stroke-width: 2px;
  stroke-opacity: 1;
}