open-consul/ui-v2/app/styles/components/with-tooltip/layout.scss

%tooltip {
  position: relative;
  display: inline-flex;
  justify-content: center;
  align-items: center;
}
%tooltip-bubble,
%tooltip-tail {
  position: absolute;
  z-index: 1;
}
%tooltip-bubble {
  padding: 10px;
  bottom: calc(100% + 5px);
  text-align: center;
  white-space: nowrap;
  content: attr(data-tooltip);
  // incase you are using text-indent to hide the
  // text of the element %with-tooltip
  text-indent: 0;
}
%tooltip-tail {
  content: '';
  left: 50%;
  margin-left: -10px;
  top: -10px;
  transform: scale(1, 0.5);
  width: 0;
  height: 0;
  background-color: transparent !important;
  border-left: 9px solid transparent;
  border-right: 9px solid transparent;
  border-top: 18px solid $ui-gray-800;
}