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HTML 

              
                
	
	<!-- 1. Создаем элемент внутри которого у нас будет отображаться карта Google Maps -->
	<div id="map"></div>

	

<!-- 3. Подключаем библиотеку Google Maps Api, чтобы создать карту -->
	<!-- Атрибуты async и defer - позволяют загружать этот скрипт асинхронно, вместе с загрузкой всей страницы  -->
	<!-- В подключении библиотеки Google Maps Api в конце указан параметр callback, после  подключения и загрузки этого Api сработает функция initMap для отрисовки карты,  которую мы описали выше -->
	<script async defer src="https://maps.googleapis.com/maps/api/js?callback=initMap"></script>
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CSS 

              
                #map {
			width: 100%;
			height: 500px;
}
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JS 

              
                // 4. Пишем скрипт который создаст и отобразит карту Google Maps на странице.

// Определяем переменную map
var map;

// Функция initMap которая отрисует карту на странице
function initMap() {

	// В переменной map создаем объект карты GoogleMaps и вешаем эту переменную на <div id="map"></div>
	map = new google.maps.Map(document.getElementById('map'), {
		// При создании объекта карты необходимо указать его свойства
		// center - определяем точку на которой карта будет центрироваться
		center: {lat: 55.760186, lng: 37.618711},
		// zoom - определяет масштаб. 0 - видно всю платнеу. 18 - видно дома и улицы города.
		zoom: 18,

		// Добавляем свои стили для отображения карты
		styles: [{"featureType":"administrative","elementType":"labels.text.fill","stylers":[{"color":"#444444"}]},{"featureType":"landscape","elementType":"all","stylers":[{"color":"#f2f2f2"}]},{"featureType":"poi","elementType":"all","stylers":[{"visibility":"off"}]},{"featureType":"road","elementType":"all","stylers":[{"saturation":-100},{"lightness":45}]},{"featureType":"road.highway","elementType":"all","stylers":[{"visibility":"simplified"}]},{"featureType":"road.arterial","elementType":"labels.icon","stylers":[{"visibility":"off"}]},{"featureType":"transit","elementType":"all","stylers":[{"visibility":"off"}]},{"featureType":"water","elementType":"all","stylers":[{"color":"#46bcec"},{"visibility":"on"}]}]
	});

	// Создаем маркер на карте
	var marker = new google.maps.Marker({

		// Определяем позицию маркера
	    position: {lat: 55.760186, lng: 37.618711},

	    // Указываем на какой карте он должен появится. (На странице ведь может быть больше одной карты)
	    map: map,

	    // Пишем название маркера - появится если навести на него курсор и немного подождать
	    title: 'Наш маркер: Большой театр',

	    // Укажем свою иконку для маркера
	    icon: 'http://rightblog.ru/wp-content/uploads/2016/07/theatre_icon.png'
	});

	// Создаем наполнение для информационного окна
	var contentString = '<div id="content">'+
	      '<div id="siteNotice">'+
	      '</div>'+
	      '<h1 id="firstHeading" class="firstHeading">Большой театр</h1>'+
	      '<div id="bodyContent">'+
	      '<p>Госуда́рственный академи́ческий Большо́й теа́тр Росси́и, или просто Большой театр — один из крупнейших' +
	      'в России и один из самых значительных в мире театров оперы и балета.</p>'+
	      '<p><b>Веб-сайт:</b> <a href="http://www.bolshoi.ru/" target="_blank">bolshoi.ru</a>'+
	      '</p>'+
	      '</div>'+
	      '</div>';

	// Создаем информационное окно
	var infowindow = new google.maps.InfoWindow({
	   content: contentString,
	   maxWidth: 400
	});

	// Создаем прослушивание, по клику на маркер - открыть инфо-окно infowindow
	marker.addListener('click', function() {
		infowindow.open(map, marker);
	});

}
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