<div id="layout-caption" class="layout">
  <div class="layout-header">
    <div class="flexbox row shrink panel padding no-br">
      <div class="flexbox col shrink align-end">
        <h2>Caption</h2>
      </div>
    </div>
  </div>
  <div class="layout-content">
    <div data-parent-selector="#tab_caption" data-selector="#interrogate_input" class="portal"></div>
  </div>
</div>