les">Rectangles</option>
            <option value="triangles">Triangles</option>
          </select>
          <button type="button" class="btn btn-primary btn-lg btn-block" id="btDownload" disabled>Download</button>
        </div>
        <div class="col-8">
          <div class="shadow-sm p-1 bg-white rounded" style="height: 500px;">
            <embed width="100%" height="100%" type="application/pdf" id="ebPreview">
          </div>
        </div>
      </div>
      <div class="row">
    <div class="sou