Toast Notifications.

<!-- Toast Notifications Section -->
        <section class="section">
            <h2>Toast Notifications</h2>
            <div class="button-group">
                <button class="btn" onclick="showToast('success')">Show Success</button>
                <button class="btn" onclick="showToast('error')">Show Error</button>
                <button class="btn" onclick="showToast('warning')">Show Warning</button>
                <button class="btn" onclick="showToast('info')">Show Info</button>
            </div>

            <!-- Toast Container -->
            <div id="toast-container"></div>
        </section>