JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://openlayers.org/api/OpenLayers.js"></script>
<div id="map" style="width:450px;height:430px;"></div>

JavaScript

map = new OpenLayers.Map("map");

var osm = new OpenLayers.Layer.OSM();
map.addLayer(osm);

map.zoomToMaxExtent();