Overlay

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import Map from 'ol/Map.js';
import Overlay from 'ol/Overlay.js';
import View from 'ol/View.js';
import {toStringHDMS} from 'ol/coordinate.js';
import TileLayer from 'ol/layer/Tile.js';
import {fromLonLat, toLonLat} from 'ol/proj.js';
import OSM from 'ol/source/OSM.js';

var layer = new TileLayer({
  source: new OSM()
});

var map = new Map({
  layers: [layer],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2
  })
});

var pos = fromLonLat([16.3725, 48.208889]);

// Vienna marker
var marker = new Overlay({
  position: pos,
  positioning: 'center-center',
  element: document.getElementById('marker'),
  stopEvent: false
});
map.addOverlay(marker);

// Vienna label
var vienna = new Overlay({
  position: pos,
  element: document.getElementById('vienna')
});
map.addOverlay(vienna);

// Popup showing the position the user clicked
var popup = new Overlay({
  element: document.getElementById('popup')
});
map.addOverlay(popup);

map.on('click', function(evt) {
  var element = popup.getElement();
  var coordinate = evt.coordinate;
  var hdms = toStringHDMS(toLonLat(coordinate));

$(element).popover('destroy');
  popup.setPosition(coordinate);
  $(element).popover({
    placement: 'top',
    animation: false,
    html: true,
    content: '<p>The location you clicked was:</p><code>' + hdms + '</code>'
  });
  $(element).popover('show');
});

<!DOCTYPE html>
<html>
  <head>
    <title>Overlay</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <style>
      #marker {
        width: 20px;
        height: 20px;
        border: 1px solid #088;
        border-radius: 10px;
        background-color: #0FF;
        opacity: 0.5;
      }
      #vienna {
        text-decoration: none;
        color: white;
        font-size: 11pt;
        font-weight: bold;
        text-shadow: black 0.1em 0.1em 0.2em;
      }
      .popover-content {
        min-width: 180px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div style="display: none;">
      <!-- Clickable label for Vienna -->
      <a class="overlay" id="vienna" target="_blank" href="http://en.wikipedia.org/wiki/Vienna">Vienna</a>
      <div id="marker" title="Marker"></div>
      <!-- Popup -->
      <div id="popup" title="Welcome to OpenLayers"></div>
    </div>
    <script>
      import Map from 'ol/Map.js';
      import Overlay from 'ol/Overlay.js';
      import View from 'ol/View.js';
      import {toStringHDMS} from 'ol/coordinate.js';
      import TileLayer from 'ol/layer/Tile.js';
      import {fromLonLat, toLonLat} from 'ol/proj.js';
      import OSM from 'ol/source/OSM.js';


      var layer = new TileLayer({
        source: new OSM()
      });

      var map = new Map({
        layers: [layer],
        target: 'map',
        view: new View({
          center: [0, 0],
          zoom: 2
        })
      });

      var pos = fromLonLat([16.3725, 48.208889]);

      // Vienna marker
      var marker = new Overlay({
        position: pos,
        positioning: 'center-center',
        element: document.getElementById('marker'),
        stopEvent: false
      });
      map.addOverlay(marker);

      // Vienna label
      var vienna = new Overlay({
        position: pos,
        element: document.getElementById('vienna')
      });
      map.addOverlay(vienna);

      // Popup showing the position the user clicked
      var popup = new Overlay({
        element: document.getElementById('popup')
      });
      map.addOverlay(popup);

      map.on('click', function(evt) {
        var element = popup.getElement();
        var coordinate = evt.coordinate;
        var hdms = toStringHDMS(toLonLat(coordinate));

        $(element).popover('destroy');
        popup.setPosition(coordinate);
        $(element).popover({
          placement: 'top',
          animation: false,
          html: true,
          content: '<p>The location you clicked was:</p><code>' + hdms + '</code>'
        });
        $(element).popover('show');
      });
    </script>
  </body>
</html>