//Add Script
<script async defer src="//maps.googleapis.com/maps/api/js?sensor=false&callback=initialize"></script>

function initialize() {
            var map;
            var bounds = new google.maps.LatLngBounds();
            var mapOptions = {
                mapTypeId: 'roadmap',
                //styles: [{"featureType":"water","elementType":"geometry","stylers":[{"color":"#e9e9e9"},{"lightness":17}]},{"featureType":"landscape","elementType":"geometry","stylers":[{"color":"#f5f5f5"},{"lightness":20}]},{"featureType":"road.highway","elementType":"geometry.fill","stylers":[{"color":"#ffffff"},{"lightness":17}]},{"featureType":"road.highway","elementType":"geometry.stroke","stylers":[{"color":"#ffffff"},{"lightness":29},{"weight":0.2}]},{"featureType":"road.arterial","elementType":"geometry","stylers":[{"color":"#ffffff"},{"lightness":18}]},{"featureType":"road.local","elementType":"geometry","stylers":[{"color":"#ffffff"},{"lightness":16}]},{"featureType":"poi","elementType":"geometry","stylers":[{"color":"#f5f5f5"},{"lightness":21}]},{"featureType":"poi.park","elementType":"geometry","stylers":[{"color":"#dedede"},{"lightness":21}]},{"elementType":"labels.text.stroke","stylers":[{"visibility":"on"},{"color":"#ffffff"},{"lightness":16}]},{"elementType":"labels.text.fill","stylers":[{"saturation":36},{"color":"#333333"},{"lightness":40}]},{"elementType":"labels.icon","stylers":[{"visibility":"off"}]},{"featureType":"transit","elementType":"geometry","stylers":[{"color":"#f2f2f2"},{"lightness":19}]},{"featureType":"administrative","elementType":"geometry.fill","stylers":[{"color":"#fefefe"},{"lightness":20}]},{"featureType":"administrative","elementType":"geometry.stroke","stylers":[{"color":"#fefefe"},{"lightness":17},{"weight":1.2}]}]
                styles: [
                    {
                        "featureType": "water",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#f3f3f3"
                            },
                            {
                                "lightness": 1
                            }
                        ]
                    },
                    {
                        "featureType": "landscape",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#95979a"
                            },
                            {
                                "lightness": 1
                            }
                        ]
                    },
                    {
                        "featureType": "road.highway",
                        "elementType": "geometry.fill",
                        "stylers": [
                            {
                                "color": "#ffffff"
                            },
                            {
                                "lightness": 17
                            }
                        ]
                    },
                    {
                        "featureType": "road.highway",
                        "elementType": "geometry.stroke",
                        "stylers": [
                            {
                                "color": "#ffffff"
                            },
                            {
                                "lightness": 29
                            },
                            {
                                "weight": 0.2
                            }
                        ]
                    },
                    {
                        "featureType": "road.arterial",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#ffffff"
                            },
                            {
                                "lightness": 18
                            }
                        ]
                    },
                    {
                        "featureType": "road.local",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#ffffff"
                            },
                            {
                                "lightness": 16
                            }
                        ]
                    },
                    {
                        "featureType": "poi",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#f5f5f5"
                            },
                            {
                                "lightness": 21
                            }
                        ]
                    },
                    {
                        "featureType": "poi.park",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#dedede"
                            },
                            {
                                "lightness": 21
                            }
                        ]
                    },
                    {
                        "elementType": "labels.text.stroke",
                        "stylers": [
                            {
                                "visibility": "on"
                            },
                            {
                                "color": "#ffffff"
                            },
                            {
                                "lightness": 16
                            }
                        ]
                    },
                    {
                        "elementType": "labels.text.fill",
                        "stylers": [
                            {
                                "saturation": 36
                            },
                            {
                                "color": "#333333"
                            },
                            {
                                "lightness": 40
                            }
                        ]
                    },
                    {
                        "elementType": "labels.icon",
                        "stylers": [
                            {
                                "visibility": "off"
                            }
                        ]
                    },
                    {
                        "featureType": "transit",
                        "elementType": "geometry",
                        "stylers": [
                            {
                                "color": "#f2f2f2"
                            },
                            {
                                "lightness": 19
                            }
                        ]
                    },
                    {
                        "featureType": "administrative",
                        "elementType": "geometry.fill",
                        "stylers": [
                            {
                                "color": "#fefefe"
                            },
                            {
                                "lightness": 20
                            }
                        ]
                    },
                    {
                        "featureType": "administrative",
                        "elementType": "geometry.stroke",
                        "stylers": [
                            {
                                "color": "#fefefe"
                            },
                            {
                                "lightness": 17
                            },
                            {
                                "weight": 1.2
                            }
                        ]
                    }
                ]
            };

            // Display a map on the page
            map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
            map.setTilt(45);
            google.maps.event.addDomListener(window, "load", initialize);


            // Multiple Markers
            var markers = [
                ['India, IST', 20.5937, 78.9629],
                ['Metropolitan France, France', 47.0000, 2.0000],
                ['Akrotiri and Dhekelia, Akrotiri', 34.5803, 32.9743],
                ['Australia, Sydney', -33.86785, 151.20732],
                ['Dubai, GST', 25.276987, 55.2708],
                ['South Africa, cape town', -33.9249, 18.4241],
                ['USA, cape town', 42.032974332441405, -102.3046875]
            ];

            // Info Window Content
            var infoWindowContent = [
                ['<div class="info_content">' +
                            '' +
                            '<p>12:30 PM IST</p>' + '</div>'],
                ['<div class="info_content">' +
                            '<h3></h3>' +
                            '<p>08:00 AM CET</p>' +
                            '</div>'],
                ['<div class="info_content">' +
                            '' +
                            '<p>09:00 AM EET </p>' + '</div>'],
                ['<div class="info_content">' +
                            '' +
                            '<p>06:00 PM AEDT</p>' + '</div>'],
                ['<div class="info_content">' +
                            '' +
                            '<p>11:00 AM GST</p>' + '</div>'],
                ['<div class="info_content">' +
                            '' +
                            '<p>09:00 AM SAST</p>' + '</div>'],
                ['<div class="info_content">' +
                            '' +
                            '<p>11:00 PM PST</p>' + '</div>']
            ];


            // Display multiple markers on a map
            var infoWindow = new google.maps.InfoWindow(),
                    marker, i;

            // Loop through our array of markers & place each one on the map  
            for (i = 0; i < markers.length; i++) {
                var position = new google.maps.LatLng(markers[i][1], markers[i][2]);
                bounds.extend(position);
                marker = new google.maps.Marker({
                    position: position,
                    map: map,
                    title: markers[i][0]
                });

                // Allow each marker to have an info window    
                google.maps.event.addListener(marker, 'click', (function (marker, i) {
                    return function () {
                        infoWindow.setContent(infoWindowContent[i][0]);
                        infoWindow.open(map, marker);
                    }
                })(marker, i));

                // Automatically center the map fitting all markers on the screen
                map.fitBounds(bounds);
            }

            // Override our map zoom level once our fitBounds function runs (Make sure it only runs once)
            var boundsListener = google.maps.event.addListener((map), 'bounds_changed', function (event) {
                this.setZoom(2);
                google.maps.event.removeListener(boundsListener);
            });

        }

//HTML VIEW
<div id="map_canvas"></div>