Pages with code samples don't shrink properly in Firefox thus making the pages unreadable on mobile

I use Firefox on Android as my main browser and every time I follow a link from Twitter to the React docs, I inevitably can't read them without then copying the link in to Chrome because body has overflow-x: hidden and the .gatsby-highlight code samples don't wrap like they do in other browsers.

An example, broken page is https://reactjs.org/docs/add-react-to-a-website.html

This issue can also be reproduced in desktop Firefox:

Personally, I don't think that code samples should wrap and they should have their own horizontal scroll, but I'll leave it up to you which you think is the best course of action. Regardless, I'd be happy to try and fix it, whichever solution you decide on.

Inizia riproducendo la pagina di esempio in Firefox su Android o desktop, quindi esamina gli stili per body overflow-x e gli esempi di codice di .gatsby-highlight. Il lavoro è completato quando la pagina della documentazione rimane leggibile sui dispositivi mobili e gli esempi di codice vanno a capo oppure forniscono un proprio scorrimento orizzontale.