JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&amp;sensor=false"></script>
<div id="map-canvas"></div>

CSS

html, body, #map-canvas {
    height: 100%;
    margin: 0px;
    padding: 0px
}

JavaScript

// This example creates circles on the map, representing
// populations in the United States.

// First, create an object containing LatLng and population for each city.
var citymap = {};
citymap['chicago'] = {
  center: new google.maps.LatLng(41.878113, -87.629798),
  population: 2842518,
  name: "Chicago"
};


function initialize() {
  // Create the map.
  var mapOptions = {
    zoom: 4,
    center: new google.maps.LatLng(37.09024, -95.712891),
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  var map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

  // Construct the circle for each value in citymap.
  // Note: We scale the population by a factor of 20.
  for (var city in citymap) {
    var populationOptions = {
      strokeColor: '#FF0000',
      strokeOpacity: 0.8,
      strokeWeight: 2,
      fillColor: '#FF0000',
      fillOpacity: 0.35,
      map: map,
      center: citymap[city].center,
      radius: citymap[city].population / 20
    };
    // Add the circle for this city to the map.
    cityCircle = new google.maps.Circle(populationOptions);
      
    // Ahora vayamos a añadir el marcador.
    new google.maps.Marker({
        position: citymap[city].center,
        map: map,
        title: citymap[city].name
    });
  }
}

google.maps.event.addDomListener(window, 'load', initialize);