To use Google maps element you must have at an Google API key in your website in order to used styling options provided by Google.
To get a Google API key you can check this article from Google Maps documentation:
https://developers.google.com/maps/documentation/javascript/get-api-key
*Make sure to enable “Maps JavaScript API” for your account and API key.
After you get the key, open Essentials theme options in your website and go to General Settings » API Keys then paste your API key and save the changes. After that you can use the google maps element with all the included options!