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

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.popover {
  position: absolute;
  top: 0;
  left: 0 #{"/* rtl:ignore */"};
  z-index: $zindex-popover;
  display: block;
  max-width: $popover-max-width;
  // Our parent element can be arbitrary since tooltips are by default inserted as a sibling of their target element.
  // So reset our font and text properties to avoid inheriting weird values.
  @include reset-text();
  @include font-size($popover-font-size);
  // Allow breaking very long words so they don't overflow the popover's bounds
  word-wrap: break-word;
  background-color: $popover-bg;
  background-clip: padding-box;
  border: $popover-border-width solid $popover-border-color;
  @include border-radius($popover-border-radius);
  @include box-shadow($popover-box-shadow);

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

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

.bs-popover-top {
  > .popover-arrow {
    bottom: subtract(-$popover-arrow-height, $popover-border-width);

    &::before {
      bottom: 0;
      border-width: $popover-arrow-height ($popover-arrow-width * .5) 0;
      border-top-color: $popover-arrow-outer-color;
    }

    &::after {
      bottom: $popover-border-width;
      border-width: $popover-arrow-height ($popover-arrow-width * .5) 0;
      border-top-color: $popover-arrow-color;
    }
  }
}

.bs-popover-end {
  > .popover-arrow {
    left: subtract(-$popover-arrow-height, $popover-border-width);
    width: $popover-arrow-height;
    height: $popover-arrow-width;