wagtail/client/scss/components/_tooltips.scss

// From Bootstrap v3.0.0
.tooltip {
  position: absolute;
  z-index: 1030;
  display: block;
  font-size: 12px;
  line-height: 1.4;
  opacity: 0;
  visibility: visible;
}

.tooltip.in {
  opacity: 0.9;
}

.tooltip.top {
  padding: 5px 0;
}

.tooltip.right {
  padding: 0 5px;
}

.tooltip.bottom {
  padding: 5px 0;
}

.tooltip.left {
  padding: 0 5px;
}

.tooltip-inner {
  max-width: 200px;
  padding: 3px 8px;
  color: #fff;
  text-align: center;
  text-decoration: none;
  background-color: #000;
  border-radius: 4px;
}

.tooltip-arrow {
  position: absolute;
  width: 0;
  height: 0;
  border-color: transparent;
  border-style: solid;
}

.tooltip.top .tooltip-arrow {
  bottom: 0;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  left: 50%;
  inset-inline-start: 50%;
  margin-inline-start: -5px;
  border-top-color: #000;
  border-width: 5px 5px 0;
}

.tooltip.top-left .tooltip-arrow {
  bottom: 0;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  left: 5px;
  inset-inline-start: 5px;
  border-top-color: #000;
  border-width: 5px 5px 0;
}

.tooltip.top-right .tooltip-arrow {
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  right: 5px;
  inset-inline-end: 5px;
  bottom: 0;
  border-top-color: #000;
  border-width: 5px 5px 0;
}

.tooltip.right .tooltip-arrow {
  top: 50%;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  left: 0;
  inset-inline-start: 0;
  margin-top: -5px;
  border-inline-end-color: #000;
  border-width: 5px 5px 5px 0;
}

.tooltip.left .tooltip-arrow {
  top: 50%;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  right: 0;
  inset-inline-end: 0;
  margin-top: -5px;
  border-inline-start-color: #000;
  border-width: 5px 0 5px 5px;
}

.tooltip.bottom .tooltip-arrow {
  top: 0;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  left: 50%;
  inset-inline-start: 50%;
  margin-inline-start: -5px;
  border-bottom-color: #000;
  border-width: 0 5px 5px;
}

.tooltip.bottom-left .tooltip-arrow {
  top: 0;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  left: 5px;
  inset-inline-start: 5px;
  border-bottom-color: #000;
  border-width: 0 5px 5px;
}

.tooltip.bottom-right .tooltip-arrow {
  top: 0;
  // Remove once we drop support for Safari 13.
  // stylelint-disable-next-line property-disallowed-list
  right: 5px;
  inset-inline-end: 5px;
  border-bottom-color: #000;
  border-width: 0 5px 5px;
}