pacing</h3>
                    <div class="fc-p-4 fc-bg-primary fc-text-white">Padding 4</div>
                    <div class="fc-m-4 fc-bg-secondary fc-text-white">Margin 4</div>
                </div>
                
                <div class="demo-item">
                    <h3>Display</h3>
                    <div class="fc-d-flex fc-justify-between fc-align-center fc-bg-light fc-p-3">
                        <span>Flex Item 1</span>
                        <span>Flex Item 2</span>
                  