How can I implement global styles in a React app using CSS-in-JS?

How can I implement global styles in a React app using CSS-in-JS?

You can use libraries like styled-components or Emotion to create global styles in your React app. Here's a basic example using styled-components.

Can you show me a code snippet for that?

Sure! Here's how you can set up global styles using styled-components:

import { createGlobalStyle } from 'styled-components';

const GlobalStyle = createGlobalStyle`
  body {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
  }
`;

function App() {
  return (
    <>
      <GlobalStyle />
      <h1>Hello World!</h1>
    </>
  );
}

This will apply the global styles to your entire application.

What if I want to override some styles in specific components?

You can still use styled-components for that! Just create styled components with the specific styles you want, and they will override the global styles.

Thanks! Are there any performance considerations I should be aware of?

Yes, using CSS-in-JS can have some performance implications, especially with large applications. It's important to optimize your styles and avoid unnecessary re-renders.