AC-1445: Unable to click Underline in TinyMCE on PageBuilder

Author: krissyhiserote

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/banner/preview.js

@@ -19,7 +19,7 @@ define([
             this._super();
 
             if (this.overlay) {
-                this.overlay.zIndex('');
+                this.overlay.css('z-index', '');
             }
         }
     });

app/code/Magento/PageBuilder/view/adminhtml/web/js/modal/confirm-alert.js

@@ -263,10 +263,16 @@ export default class Preview extends BasePreview {
             wysiwygConfig.adapter.settings.auto_focus = this.element.id;
             wysiwygConfig.adapter.settings.init_instance_callback = (editor: Editor) => {
                 editor.on("focus", () => {
-                    $(this.element).parents(this.bannerOverlaySelector).zIndex(this.activeEditorOverlayZIndex);
+                    $(this.element).parents(this.bannerOverlaySelector).css(
+                        "z-index",
+                        this.activeEditorOverlayZIndex,
+                    );
                 });
                 editor.on("blur", () => {
-                    $(this.element).parents(this.bannerOverlaySelector).zIndex(this.defaultOverlayZIndex);
+                    $(this.element).parents(this.bannerOverlaySelector).css(
+                        "z-index",
+                        this.defaultOverlayZIndex,
+                    );
                     nestingLinkDialog(this.contentType.dataStore, this.wysiwyg, "message", "link_url");
                     nestingWidgetDialog(this.contentType.dataStore, this.wysiwyg, "message", "link_url");
                 });