Acme.BookStore.HttpApi.Host/node_modules/bootstrap-v4-rtl/scss/_dropdown.scss

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// The dropdown wrapper (`<div>`)
.dropup,
.dropright,
.dropdown,
.dropleft {
  position: relative;
}

.dropdown-toggle {
  white-space: nowrap;

  // Generate the caret automatically
  @include caret();
}

// The dropdown menu
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: $zindex-dropdown;
  display: none; // none by default, but block on "open" of the menu
  float: left;
  min-width: $dropdown-min-width;
  padding: $dropdown-padding-y $dropdown-padding-x;
  margin: $dropdown-spacer 0 0; // override default ul
  @include font-size($dropdown-font-size);
  color: $dropdown-color;
  text-align: left; // Ensures proper alignment if parent has it changed (e.g., modal footer)
  list-style: none;
  background-color: $dropdown-bg;
  background-clip: padding-box;
  border: $dropdown-border-width solid $dropdown-border-color;
  @include border-radius($dropdown-border-radius);
  @include box-shadow($dropdown-box-shadow);
}

@each $breakpoint in map-keys($grid-breakpoints) {
  @include media-breakpoint-up($breakpoint) {
    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);

    .dropdown-menu#{$infix}-left {
      right: auto;
      left: 0;
    }

    .dropdown-menu#{$infix}-right {
      right: 0;
      left: auto;
    }
  }
}

// Allow for dropdowns to go bottom up (aka, dropup-menu)
// Just add .dropup after the standard .dropdown class and you're set.
.dropup {
  .dropdown-menu {
    top: auto;
    bottom: 100%;
    margin-top: 0;