
    <button type="button" id="structure-btn" >Structure: Hierarchy</button>
    <button type="button" id="physics-btn" >Physics: Off</button>
    <button type="button" id="fileLinks-btn" >FileLinks: Off</button>
   
    <div id="error-container">
      <button type="button" id="error-window-btn" >&#10094;</button>
      <button type="button" id="legend-btn" >&#10095;</button>
     
      <div id="slideout">
        <span id="error-list-title"><h3 style="text-align: center">Notifications</h3></span>
       