index page does not look the same and heroku is not free

I've been following the steps as they've been written but I've come across a few issues I urgently need to fix. (i only have a day to fix this for a project)
1- when initializing the cockroachdb leaderboard table in the fourth step of the entire tutorial, the 'cockroach sql' command does not work, it says 'cockroach' is not recognized in the terminal.
2- when I run index.html on a server, the layout looks very different. is there some sort of CSS extension i should've added or did i miss a step?
3- heroku does not offer a free trial to use to create this app. do i need it or is it a step i can skip?

please help.

Examinez la quatrième étape du tutoriel, la page index.html et les instructions de configuration de CockroachDB. Reproduisez l’échec de la commande cockroach sql et la mise en page différente, puis vérifiez si l’étape concernant Heroku est toujours nécessaire. C’est terminé lorsque la configuration documentée fonctionne, que la page s’affiche comme indiqué et que l’exigence concernant Heroku est clairement expliquée.

Rédigé par le modèle d'indexation à partir du texte de l'issue.