  <div class="col-1"><div class="demo-grid-item">col-1</div></div>
            </div>

            <h3 class="h4 mb-4">Responsive Grid</h3>
            <div class="row mb-6">
                <div class="col-12 col-md-6 col-lg-4">
                    <div class="demo-grid-item">col-12 col-md-6 col-lg-4</div>
                </div>
                <div class="col-12 col-md-6 col-lg-4">
                    <div class="demo-grid-item">col-12 col-md-6 col-lg-4</div>
                </div>
                <div cl