    </div>
        </div>
        
        <div class="preview-panel">
            <div id="flexContainer" class="flex-container">
                <div class="flex-item" onclick="selectItem(0)">
                    <div class="item-number">1</div>
                    <div class="item-props"></div>
                </div>
                <div class="flex-item" onclick="selectItem(1)">
                    <div class="item-number">2</div>
                    <div class="item-props"></div>
                </div>