monochromatic-map.json

[
  {
    "featureType": "poi",
    "stylers": [
      { "visibility": "off" }
    ]
  },{
    "elementType": "labels.text",
    "stylers": [
      { "color": "#000000" }
    ]
  },{
    "elementType": "labels.text.stroke",
    "stylers": [
      { "color": "#ffffff" },
      { "weight": 3 }
    ]
  },{
    "featureType": "transit",
    "stylers": [
      { "color": "#cccccc" }
    ]
  },{
    "featureType": "road",
    "elementType": "geometry.stroke",
    "stylers": [
      { "visibility": "off" }
    ]
  },{
    "featureType": "road",
    "elementType": "geometry",
    "stylers": [
      { "color": "#000000" }
    ]
  },{
    "featureType": "landscape.natural",
    "stylers": [
      { "color": "#ffffff" }
    ]
  },{
    "featureType": "water",
    "elementType": "geometry",
    "stylers": [
      { "color": "#666666" }
    ]
  },{
    "featureType": "road.local",
    "elementType": "labels.text",
    "stylers": [
      { "visibility": "off" }
    ]
  },{
    "elementType": "labels",
    "stylers": [
      { "saturation": -100 }
    ]
  },{
    "featureType": "administrative",
    "elementType": "geometry.fill",
    "stylers": [
      { "saturation": -100 }
    ]
  }
]