Change Google Maps colours - Liven up your embedded Google Maps with some colour changes. - https://www.damiencarbery.com/2020/07/change-google-maps-colours/

google-maps-json-colouring.html

<div id="map"></div>
<script>
var address = "A94 A2T7, Ireland";
var infoWindowContent = '<strong>Reform Dublin Blackrock</strong><br />Bath Place (behind Blackrock Main Street)<br />Blackrock<br />Co. Dublin</p>';
var zoomLevel = 16;


function initialize() {
  var myOptions = {
    zoom: zoomLevel,
    //mapTypeControl: false,
    navigationControl: true,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    styles: [
			  {
				"elementType": "geometry",
				"stylers": [{"color": "#f5f5f5"}]
			  },
			  {
				"elementType": "labels.icon",
				"stylers": [{"visibility": "off"}]
			  },
			  {
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#616161"}]
			  },
			  {
				"elementType": "labels.text.stroke",
				"stylers": [{"color": "#f5f5f5"}]
			  },
			  {
				"featureType": "administrative.land_parcel",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#bdbdbd"}]
			  },
			  {
				"featureType": "poi",
				"elementType": "geometry",
				"stylers": [{"color": "#eeeeee"}]
			  },
			  {
				"featureType": "poi",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#757575"}]
			  },
			  {
				"featureType": "poi.park",
				"elementType": "geometry",
				"stylers": [{"color": "#e5e5e5"}]
			  },
			  {
				"featureType": "poi.park",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#9e9e9e"}]
			  },
			  {
				"featureType": "road",
				"elementType": "geometry",
				"stylers": [{"color": "#ffffff"}]
			  },
			  {
				"featureType": "road.arterial",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#757575"}]
			  },
			  {
				"featureType": "road.highway",
				"elementType": "geometry",
				"stylers": [{"color": "#dadada"}]
			  },
			  {
				"featureType": "road.highway",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#616161"}]
			  },
			  {
				"featureType": "road.local",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#9e9e9e"}]
			  },
			  {
				"featureType": "transit.line",
				"elementType": "geometry",
				"stylers": [{"color": "#e5e5e5"}]
			  },
			  {
				"featureType": "transit.station",
				"elementType": "geometry",
				"stylers": [{"color": "#eeeeee"}]
			  },
			  {
				"featureType": "water",
				"elementType": "geometry",
				"stylers": [{"color": "#aadaff"}]
			  },
			  {
				"featureType": "water",
				"elementType": "labels.text.fill",
				"stylers": [{"color": "#aadaff"}]
			  }
			]  };
  var map = new google.maps.Map(document.getElementById("map"), myOptions);
  var geocoder = new google.maps.Geocoder();
  if (geocoder) {
    geocoder.geocode({
      'address': address
    }, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        if (status != google.maps.GeocoderStatus.ZERO_RESULTS) {
          map.setCenter(results[0].geometry.location);

          var infowindow = new google.maps.InfoWindow({
            content: infoWindowContent,
          });

          var marker = new google.maps.Marker({
            position: results[0].geometry.location,
            map: map,
            title: address
          });
          google.maps.event.addListener(marker, 'click', function() {
            infowindow.open(map, marker);
          });
		  // Open info window on load.
		  google.maps.event.addListenerOnce(map, 'tilesloaded', function() { infowindow.open(map, marker); });
        } else {
          alert("No results found");
        }
      } else {
        alert("Geocode was not successful for the following reason: " + status);
      }
    });
  }
}
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initialize" async defer></script>