MyJavawebProject/WebContent/scss/bootstrap/_popover.scss

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.popover {
  position: absolute;
  top: 0;
  left: 0;
  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();
  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);

  .arrow {
    position: absolute;
    display: block;
    width: $popover-arrow-width;
    height: $popover-arrow-height;
    margin: 0 $border-radius-lg;

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

.bs-popover-top {
  margin-bottom: $popover-arrow-height;

  .arrow {
    bottom: calc((#{$popover-arrow-height} + #{$popover-border-width}) * -1);
  }

  .arrow::before,
  .arrow::after {
    border-width: $popover-arrow-height ($popover-arrow-width / 2) 0;
  }

  .arrow::before {
    bottom: 0;
    border-top-color: $popover-arrow-outer-color;
  }

  .arrow::after {
    bottom: $popover-border-width;
    border-top-color: $popover-arrow-color;
  }
}