maps_style.json

        {
          "featureType": "poi.park",
          "stylers": [
            { "color": "#AEB364" }
          ]
        },{
          "featureType": "road",
          "elementType": "geometry",
          "stylers": [
            { "color": "#E0D9CA" }
          ]
        },{
          "featureType": "road",
          "elementType": "geometry.stroke",
          "stylers": [
            { "color": "#ffffff" },
            { "weight": 5.4 }
          ]
        },{
          "featureType": "landscape.man_made",
          "elementType": "geometry.fill",
          "stylers": [
            { "color": "#D0C8B5" }
          ]
        },{
          "featureType": "landscape.man_made",
          "elementType": "geometry.stroke",
          "stylers": [
            { "color": "#A8A18D" },
            { "weight": 1.1 },
            { "visibility": "on" }
          ]
        },{
          "featureType": "transit.line",
          "elementType": "geometry.fill",
          "stylers": [
            { "color": "#808080" },
            { "visibility": "on" }
          ]
        }
      ];
      
      map.setOptions({styles: styles});