MyMongodb/node_modules/bootstrap/scss/_modal.scss

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// .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


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

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

// Container that the modal scrolls within
.modal {
  position: fixed;
  top: 0;
  left: 0;
  z-index: $zindex-modal;
  display: none;
  width: 100%;
  height: 100%;
  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
}

// 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: $modal-fade-transform;
  }
  .modal.show & {
    transform: $modal-show-transform;
  }

  // When trying to close, animate focus to scale
  .modal.modal-static & {
    transform: $modal-scale-transform;
  }
}

.modal-dialog-scrollable {
  display: flex; // IE10/11
  max-height: subtract(100%, $modal-dialog-margin * 2);