weseek__growi/packages/app/src/styles/_modal.scss

@mixin expand-modal-fullscreen($hasModalHeader: true, $hasModalFooter: true) {
  // full-screen modal
  width: auto;
  max-width: unset !important;
  height: calc(100vh - 30px);
  margin: 15px !important;

  .modal-content {
    height: calc(100vh - 30px);
  }

  // expand .modal-body (with calculating height)
  .modal-body {
    $modal-header: 54px;
    $modal-footer: 46px;

    $margin: 0px;
    @if $hasModalHeader {
      $margin: $margin + $modal-header;
    }
    @if $hasModalFooter {
      $margin: $margin + $modal-footer;
    }
    height: calc(100% - #{$margin});
  }
}

// expanded window layout
.modal-dialog.grw-modal-expanded {
  @include expand-modal-fullscreen(true, true);
}

// expanded window layout without modal-header & modal-footer
.modal-dialog.grw-body-only-modal-expanded {
  @include expand-modal-fullscreen(false, false);
}