Frontend/static/styles/tooltipster/themes/tooltipster-light.css

.tooltipster-light {
  border-radius: 5px;
  border: 1px solid #cccccc;
  background: #ededed;
  color: #666666;
}
.tooltipster-light .tooltipster-content {
  font-family: Arial, sans-serif;
  font-size: 14px;
  line-height: 16px;
  padding: 8px 10px;
}