Hey there,

From 11 June 2018 Google Maps will be greyed out and covered with a watermark for certain users of the Google Maps APIs (Google Maps Platform). This indicates that the code for the application, solution or website concerned does not include an ‘API key’. https://developers.google.com/maps/faq – https://developers.google.com/maps/documentation/javascript/get-api-key

Also, you can begin kick start with default template:

https://www.awesomescreenshot.com/image/4212803/79b3813bf18611f33db76cbbc4f6c60e