JSFiddle - React, Tailwind, and code Playground

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
    <style type="text/css">
        #map {
            width: 512px;
            height: 512px;
            border: 1px solid black;
        }
        .olControlLoadingPanel {
            background-image:url(http://dev.openlayers.org/addins/loadingPanel/trunk/theme/default/img/loading.gif);
            margin-left: 30%;
            margin-top: 50%;
            position: relative;
            width: 195px;
            height: 11px;
            background-position:center;
            background-repeat:no-repeat;
            display: none;
        }
    </style>
    <script src="http://openlayers.org/dev/lib/OpenLayers.js"></script>
    <script src="http://dev.openlayers.org/addins/loadingPanel/trunk/lib/OpenLayers/Control/LoadingPanel.js"></script>
    <script type="text/javascript">
    </script>
  </head>
  <body>
    <h1 id="title">LoadingPanel example</h1>
    
    <div id="tags">
    </div>
        <p id="shortdesc">
            Shows an example of the LoadingPanel control
        </p>
    <div id="map"></div>
  </body>
</html>

JavaScript

var lon = -93;
var lat = 56;
var zoom = 3;
var map, layer;

map = new OpenLayers.Map('map', {
    controls: []
});
map.addControl(new OpenLayers.Control.LoadingPanel());
map.addControl(new OpenLayers.Control.PanZoomBar());

layer = new OpenLayers.Layer.WMS("OpenLayers WMS", "http://labs.metacarta.com/wms/vmap0", {
    layers: 'basic'
}, {
    singleTile: false,
    buffer: 0,
    ratio: 1
});
map.addLayer(layer);

map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
map.addControl(new OpenLayers.Control.LayerSwitcher());