JSFiddle - React, Tailwind, and code Playground

by Hemerson Prestes

HTML

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.4.0/ol.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/ol3/3.4.0/ol.js"></script>
<div id="map" class="map">
  <div id="center"></div>
</div>

CSS

html, body, #map {
    height: 100%;
    width: 100%;
    margin: 0;
}

#center {
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin-top: -20px;
    margin-left: -20px;
    padding-top: 10px;
    padding-left: 10px;
    border: 2px solid red;
    z-index: 10000;
    position: relative;
}

JavaScript

var map = new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  target: 'map',
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});