">Grid System</h2>
            
            <h3 class="h4 mb-4">12-Column Grid</h3>
            <div class="row mb-6">
                <div class="col-1"><div class="demo-grid-item">col-1</div></div>
                <div class="col-1"><div class="demo-grid-item">col-1</div></div>
                <div class="col-1"><div class="demo-grid-item">col-1</div></div>
                <div class="col-1"><div class="demo-grid-item">col-1</div></div>
                <div class="col-1"><div class="demo-grid-item">col-1<