  <div class="col-3-">
          <select class="form-control btn-block" id="edSelExample" autofocus>
            <option selected disabled>-- Select an example --</option>
            <option value="hello">Hello world</option>
            <option value="font">Font faces, text alignment and rotation</option>
            <option value="two_page">Two page Hello World</option>
            <option value="circles">Circles</option>
            <option value="lines">Lines</option>
            <option value="rectang