      <div class="container">
            <h2 class="h2 text-center mb-8">Spacing System</h2>
            
            <h3 class="h4 mb-4">Margin Utilities</h3>
            <div class="demo-utility-grid mb-6">
                <div class="demo-spacing-box m-0">.m-0</div>
                <div class="demo-spacing-box m-1">.m-1</div>
                <div class="demo-spacing-box m-2">.m-2</div>
                <div class="demo-spacing-box m-3">.m-3</div>
                <div class="demo-spacing-box m-4">.m-4</di