JSFiddle - React, Tailwind, and code Playground

HTML

<body>

  <div id="map"></div>
  <script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBYkokiNLc6ksDgKlkI0aLuhF9Lwbl1dX0&callback=initMap"></script>

</body>

CSS

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#floating-panel {
  margin-left: -100px;
}

JavaScript

'use strict'

var panorama;

function initMap() {
	var s = {
	  	markerURL: 'https://www.immediateentourage.com/ie/wp-content/uploads/2011/10/Wind+Turbine+Original+Photo+by+Eclipse.sx_2.png',		// url of the marker
	  	scaleFactor: 1.5,				// marker scale factor
	  	maxDistance: 1500,			// max distance at which the marker is still visible (meter)
	}
  
  // positions of the windmills
  var mill_pos = [
    {lat: 53.284068, lng: 6.372359},
    {lat: 53.281593, lng: 6.371393},
    {lat: 53.281927, lng: 6.371424},
    {lat: 53.282388, lng: 6.371357},
    {lat: 53.282926, lng: 6.371250},
    {lat: 53.283299, lng: 6.371261},
  ];

  // start position
  var startPos = {lat: 53.281413, lng: 6.371178};

  // Set up the map
  var map = new google.maps.Map(document.getElementById('map'), {
    center: startPos,
    zoom: 18,
    streetViewControl: false
  });


  // find size of original image and apply factor
  var size = getSize(s.markerURL, function(size){
    
    size.width = size.width*s.scaleFactor;
    size.height = size.height*s.scaleFactor;

    // create the custom windmill marker
    var pinIcon = new google.maps.MarkerImage(
        s.markerURL,
        null, /* size is determined at runtime */
        null, /* origin is 0,0 */
        null, /* anchor is bottom center of the scaled image */
        new google.maps.Size(size.width, size.height)
    );

    // place the markers
    var mill_markers = [];
    mill_pos.forEach(function(pos){
      mill_markers.push(new google.maps.Marker({
        position: pos,
        map: map,
        icon: pinIcon,
        title: 'Windmolen EAZ'
      }))
    })


  });

  // We get the map's default panorama and set up some defaults.
  // Note that we don't yet set it visible.
  panorama = map.getStreetView();
  panorama.setPosition(startPos);
  panorama.setPov(/** @type {google.maps.StreetViewPov} */({
    heading: 0,
    pitch: 0
  }));
  panorama.setVisible(true);
}


function getSize(url, res){   
    var img = new...