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.

Revisa el cuarto paso del tutorial, la página index.html y las instrucciones de configuración de CockroachDB. Reproduce el fallo del comando cockroach sql y el diseño diferente, y después comprueba si el paso de Heroku sigue siendo necesario. Se considera terminado cuando la configuración documentada funciona, la página se muestra como se indica y el requisito de Heroku está explicado claramente.

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