a>
          </div>
          <div class="col-md-4 col-sm-6 portfolio-item">
            <a class="portfolio-link" href="graph/donut_label.html">
              <div class="portfolio-hover">
                <div class="portfolio-hover-content">
                  <p>Add annotation</p>
                  <hr />
                  <p class="explanation_portfolio">
                    Add annotation outside the chart using polylines
                  </p>
                </div>
              </div>
              <