street view into post detail

HEllo

i am trying to add to post detail google streetview

i added this code to single.php

<p>street view</p>
 <div id="street-view"></div>
    <script>
      var panorama;
      function initialize() {
        panorama = new google.maps.StreetViewPanorama(
            document.getElementById('street-view'),
            {
              position: {lat: 37.869260, lng: -122.254811},
              pov: {heading: 165, pitch: 0},
              zoom: 1
            });
      }
    </script>
    <script async defer
         src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCr3AH3RlOBfNzix01oIipkOgIU4_qeVYw&callback=initialize">
    </script>

But its not displaying
see screen https://snag.gy/AX9EIH.jpg
post detail:https://www.najdipsc.cz/posta/praha-4/
Many thanks for help