"domContainerNode is not defined." How do I fix this?

Shopify Partner
19 1 3

Hi, everyone!
I want to show the button which displays "Button clicked!" on the screen using my index.js below.



import {AppProvider, Button} from '@shopify/polaris';
import React from 'react';
import ReactDOM from 'react-dom';

const app = (
<Button onClick={() => alert('Button clicked!')}>Example button</Button>

ReactDOM.render(app, domContainerNode);

export default app;




But then, the screen shows me "domContainerNode is not defined."


How do I fix the above to display the button?
In addition, I have already published the other files to display the button on GitHub.

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