rce-controls">
          <a id="copy-button"><i class="fa fa-clipboard"></i> Copy</a>
          <a id="codepen-button"><i class="fa fa-codepen"></i> Edit</a>
        </div>
        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Shaded Relief</textarea>
          <textarea class="hidden" name="description">Calculate shaded relief from elevation data</textarea>
          <textarea class="hidden" name="js">/**
 * Ge