Acme.BookStore.HttpApi.Host/node_modules/bootstrap/scss/_tooltip.scss

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// Base class
.tooltip {
  position: absolute;
  z-index: $zindex-tooltip;
  display: block;
  margin: $tooltip-margin;
  // Our parent element can be arbitrary since tooltips are by default inserted as a sibling of their target element.
  // So reset our font and text properties to avoid inheriting weird values.
  @include reset-text();
  @include font-size($tooltip-font-size);
  // Allow breaking very long words so they don't overflow the tooltip's bounds
  word-wrap: break-word;
  opacity: 0;

  &.show { opacity: $tooltip-opacity; }

  .tooltip-arrow {
    position: absolute;
    display: block;
    width: $tooltip-arrow-width;
    height: $tooltip-arrow-height;

    &::before {
      position: absolute;
      content: "";
      border-color: transparent;
      border-style: solid;
    }
  }
}

.bs-tooltip-top {
  padding: $tooltip-arrow-height 0;

  .tooltip-arrow {
    bottom: 0;

    &::before {
      top: -1px;
      border-width: $tooltip-arrow-height ($tooltip-arrow-width * .5) 0;
      border-top-color: $tooltip-arrow-color;
    }
  }
}

.bs-tooltip-end {
  padding: 0 $tooltip-arrow-height;

  .tooltip-arrow {
    left: 0;
    width: $tooltip-arrow-height;
    height: $tooltip-arrow-width;

    &::before {
      right: -1px;
      border-width: ($tooltip-arrow-width * .5) $tooltip-arrow-height ($tooltip-arrow-width * .5) 0;
      border-right-color: $tooltip-arrow-color;
    }
  }
}