The module create a styled Google map.
Install the Styled Google Map module and Geofield module as normal.
Go to your project/drupal root and run from your project root : composer require "phayes/geophp
Once it's done downloading it should appear in your project root /vendor/phayes folder.
Create a new content type with a geofield field.
In Manage display you choose for Google Map Field as format. In the settings you can change the width en height size of the map but also add a custom style for your map in Map Style.
you can write your own style or copy and paste one of the styles you can find on https://snazzymaps.com/ in the json style field.
Create new content and in the Geofield field you write POINT (longitude latitude). The longitude and latitude of you location you can find at http://www.mapcoordinates.net/en