resvonsive height column

<div class="col-sm-6 col-md-6">
          <div class="thumbnail">
            <?php
            if(empty($post_new->userfile)) {echo "<img src='".base_url()."assets/images/no_image_thumb.png' width='400' height='200'>";}
            else { echo " <img src='".base_url()."assets/images/berita/".$post_new->userfile.'_thumb'.$post_new->userfile_type."'> ";}
            ?>
            <div align="right">
              <span class="label label-success"><i class="fa fa-tag"></i> <?php echo $post_new->kategori ?></span>
              <span class="label label-warning"><i class="fa fa-user"></i> <?php echo $post_new->author ?></span>
              <span class="label label-info"><i class="fa fa-clock-o"></i> <?php echo $post_new->time_upload ?></span>
            </div>
            <div class="caption">
              <h4><a href="<?php echo base_url("berita/read/$post_new->judul_seo ") ?>"><?php echo $post_new->judul_berita ?></a></h4>
              <?php echo $caption ?>
            </div>
            <p align="right">
              <a href="<?php echo base_url("berita/read/$post_new->judul_seo ") ?>">
                <button type="button" class="btn-sm btn-primary">
                  Selengkapnya <i class="fa fa-arrow-circle-right"></i>
                </button>
              </a>
            </p>
          </div>
        </div>