'parent')">Parent</button>
                <button class="tab" onclick="showTab('child')">Children</button>
            </div>
            
            <div id="parent-controls">
                <div class="control-group">
                    <h3>Container Setup</h3>
                    
                    <div class="control-item">
                        <label>display</label>
                        <select id="display" onchange="updateStyles()">
                            <option value="flex">flex</op