_modal.scss

// .modal-open      - body class for killing the scroll
// .modal           - container to scroll within
// .modal-dialog    - positioning shell for the actual modal
// .modal-content   - actual modal w/ bg and corners and stuff


// Kill the scroll on the body
.modal-open {
  overflow: hidden;
}

// Container that the modal scrolls within
.modal {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: $zindex-modal;
  display: none;
  overflow: hidden;
  // Prevent Chrome on Windows from adding a focus outline. For details, see
  // https://github.com/twbs/bootstrap/pull/10951.
  outline: 0;
  // We deliberately don't use `-webkit-overflow-scrolling: touch;` due to a
  // gnarly iOS Safari bug: https://bugs.webkit.org/show_bug.cgi?id=158342
  // See also https://github.com/twbs/bootstrap/issues/17695

  .modal-open & {
    overflow-x: hidden;
    overflow-y: auto;
  }
}

// Shell div to position the modal with bottom padding
.modal-dialog {
  position: relative;
  width: auto;
  margin: $modal-dialog-margin;
  // allow clicks to pass through for custom click handling to close modal
  pointer-events: none;

  // When fading in the modal, animate it to slide down
  .modal.fade & {
    @include transition($modal-transition);
    transform: translate(0, -25%);
  }
  .modal.show & {
    transform: translate(0, 0);
  }
}

.modal-dialog-centered {
  display: flex;
  align-items: center;
  min-height: calc(100% - (#{$modal-dialog-margin} * 2));
}

// Actual modal
.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%; // Ensure `.modal-content` extends the full width of the parent `.modal-dialog`
  // counteract the pointer-events: none; in the .modal-dialog
  pointer-events: auto;
  background-color: $modal-content-bg;
  background-clip: padding-box;
  border: $modal-content-border-width solid $modal-content-border-color;
  @include border-radius($modal-content-border-radius);