           const items = document.querySelectorAll('.flex-item');
            const item = items[selectedItem];
            if (!item) return;
            
            const flexGrow = document.getElementById('flexGrow').value;
            const flexShrink = document.getElementById('flexShrink').value;
            const flexBasis = document.getElementById('flexBasis').value;
            const alignSelf = document.getElementById('alignSelf').value;
            const order = document.getElementById('order').v