/**
 * Core (jQuery UI) dialogs opened from a Bootstrap 4 modal, e.g. the entity
 * browser of an image field while editing a paragraph in the front-end:
 * jQuery UI puts them at z-index 100 (.ui-front), below the Bootstrap modal
 * (1050) and its backdrop (1040). Same values as Seven (dialog.css), above the
 * admin toolbar (1250).
 */
.ui-widget-overlay.ui-front {
  z-index: 1259;
}
.ui-dialog.ui-front {
  z-index: 1260;
}