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app/javascript/gabsocial/components/modal/modal_loading.js

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+import ColumnIndicator from '../column_indicator';
+
+// Keep the markup in sync with <BundleModalError />
+// (make sure they have the same dimensions)
+export default class ModalLoading extends PureComponent {
+  render() {
+    return (
+      <div className='modal-root__modal error-modal'>
+        <div className='error-modal__body'>
+          <ColumnIndicator type='loading' />
+        </div>
+        <div className='error-modal__footer'>
+          <div>
+            <button className='error-modal__nav onboarding-modal__skip' />
+          </div>
+        </div>
+      </div>
+    );
+  }
+}