Summary
The CSS ecosystem has evolved a lot in recent years, and the Next.js team keeps the framework up to date with the most modern, performant, and modular solutions for writing CSS styles.
In this chapter, we've looked at three different built-in solutions, and of course, any one of them has some trade-offs compared with the others.
Styled JSX, for instance, is definitely one of the easiest ways of writing CSS rules. You can interoperate with JavaScript, dynamically change some CSS rules and properties depending on the user actions, and so on, but it also has some significant drawbacks. Like most CSS-in-JS libraries, Styled JSX first renders on the server side but re-renders the whole generated CSS on the client right after React hydration occurs. That adds some runtime cost to your application, making your application less performant and more challenging to scale. Also, it makes it impossible for the browser to cache your CSS rules, as they get regenerated on every...
