Hi nauna,
I have checked the article its working. There might be problem with your API key.
So please check the browser console window for the error details you are getting.
You have exceeded your daily request quota for this API. If you did not set a custom daily request quota, verify your project has an active billing account
If you are getting the above error please refer below link.
https://stackoverflow.com/questions/51876818/google-map-geocode-api-free-daily-limit-get-over-in-one-hit-it-happening-due-to