map.js

var simplified = { visibility: 'simplified' };
var style = {
  'minimal': [
    { featureType: 'all', 
      stylers: [{ visibility: 'off' }] },
      
    { featureType: 'water',
      stylers: [{ hue: 0 }, { visibility: 'on' }, { lightness: 0 }, { saturation: 0 }] },

    { featureType: 'water', elementType: 'label', stylers: [simplified] },

    { featureType: 'road',
      stylers: [simplified, { lightness: -50 }, { saturation: -100 }],
      elementType: 'label',
      stylers: [simplified, { lightness: -51 }, { saturation: -100 }] },

    { featureType: 'road.highway',
      elementType: 'label',
      stylers: [{ visibility: 'off' }] },

    { featureType: 'road.arterial',
      elementType: 'label',
      stylers: [simplified] },

    { featureType: 'road.local',
      elementType: 'label' },

    { featureType: 'landscape',
      stylers: [{ hue: 10 }, simplified, { lightness: -50 }, { saturation: -30 } ] },
      
    { featureType: 'landscape',
      elementType: 'label',
      stylers: [{ visibility: 'off' }] },
      
    { featureType: "transit.station",
      stylers: [{ visibility: "on" }, { lightness: -20 }, { saturation: -90 }] }
  ]
};