<div class="container">
  <div class="sidebar-panel-header">
    <div class="title weburl" data-click="onTitleClicked">Viewer</div>
    <div style="flex-grow: 1"></div>
    <div class="icon-container" data-click="onTitleClicked">
      <div class="titlebar-icon titlebar-icon-external"></div>
    </div>
    <div class="icon-container" data-click="onAttachIconClicked">
      <div class="titlebar-icon titlebar-icon-close"></div>
    </div>
  </div>
  <div class="webview-container">
  </div>
</div>
