Once the code rendered on the server side reaches the browser, and the frontend script takes over, we need to remove the server-side injected CSS when the main component mounts. This will give back full control over rendering the React app to the client side:
mern-skeleton/client/MainRouter.js:
componentDidMount() { const jssStyles = document.getElementById('jss-server-side') if (jssStyles && jssStyles.parentNode) jssStyles.parentNode.removeChild(jssStyles)}
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