/* container behind the text */
.dash-tooltip {
  background-color: #333 !important;
  border-radius: 4px;
}

/* arrow pointing down */
.dash-tooltip:before,
.dash-tooltip:after {
  border-bottom-color: #333 !important;
}

/* the tooltip text */
.dash-table-tooltip {
  color: #fff !important;
  background-color: #333 !important;
  padding: 4px 8px;
  font-size: 0.9rem;
}