ded for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.6.5/build/ol.js"&gt;&lt;/script&gt;
    &lt;style&gt;
      @media (min-width: 800px) {
        .half {
          padding: 0 10px;
          width: 50%;
          float: left;
        }
      }
    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
  