JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.6.0/ol.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.6.0/ol.css">
<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"><div id="popup"></div></div>
  </div>
</div>

CSS

#map {
  position: relative;
}
#popup {
  padding-bottom: 45px;
}

JavaScript

var iconFeature = new ol.Feature({
  geometry: new ol.geom.Point([0, 0]),
  name: 'Null Island',
  population: 4000,
  rainfall: 500
});

var iconStyle = new ol.style.Style({
  image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
    anchor: [0.5, 46],
    anchorXUnits: 'fraction',
    anchorYUnits: 'pixels',
    opacity: 0.75,
    src: 'http://openlayers.org/en/v3.6.0/examples/data/icon.png'
  })),
  text: new ol.style.Text({
      text: 'The label',
      fill: new ol.style.Fill({color: 'black'}),
      stroke: new ol.style.Stroke({color: 'yellow', width: 1}),
      offsetX: -20,
      offsetY: 20
  })
});

iconFeature.setStyle(iconStyle);

var vectorSource = new ol.source.Vector({
  features: [iconFeature]
});

var vectorLayer = new ol.layer.Vector({
  source: vectorSource
});

var rasterLayer = new ol.layer.Tile({
  source: new ol.source.TileJSON({
    url: 'http://api.tiles.mapbox.com/v3/mapbox.geography-class.jsonp',
    crossOrigin: ''
  })
});

var map = new ol.Map({
  layers: [rasterLayer, vectorLayer],
  target: document.getElementById('map'),
  view: new ol.View({
    center: [0, 0],
    zoom: 3
  })
});

var element = document.getElementById('popup');

var popup = new ol.Overlay({
  element: element,
  positioning: 'bottom-center',
  stopEvent: false
});
map.addOverlay(popup);

// display popup on click
map.on('click', function(evt) {
  var feature = map.forEachFeatureAtPixel(evt.pixel,
      function(feature, layer) {
        return feature;
      });
  if (feature) {
    var geometry = feature.getGeometry();
    var coord = geometry.getCoordinates();
    popup.setPosition(coord);
    $(element).popover({
      'placement': 'top',
      'html': true,
      'content': feature.get('name')
    });
    $(element).popover('show');
  } else {
    $(element).popover('destroy');
  }
});

// change mouse cursor when over marker
map.on('pointermove', function(e) {
  if (e.dragging) {
    $(element).popover('destroy');
    return;
  }
  var pixel =...