title: Two sidebars in flexdashboard layout
body: <p>I would appreciate some css help here.<br>
  What I am trying to achieve is the following layout.</p>
  
  <p><a href="https://i.stack.imgur.com/NGqGm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NGqGm.png" alt="enter image description here"></a></p>
  
  <p>I can easily get to the layout without the right sidebar:</p>
  
  <pre><code>---
  title: "Title"
  output: 
    flexdashboard::flex_dashboard:
      vertical_layout: fill
      orientation: rows
      css: styles.css
  runtime: shiny
  ---
  
  Page 1 {data-orientation=rows}
  =====================================
  
  Row {.sidebar}
  -----------------------------------------------------------------------
  ### Inputs 1
  
  Row 
  -----------------------------------------------------------------------
  
  ### Chart 1
  
  ### Chart 2
  Row 
  -----------------------------------------------------------------------
  
  ### Chart 3
  Row 
  -----------------------------------------------------------------------
  
  ### Chart 4
  
  ### Chart 5
  </code></pre>
  
  <p>I tried to add a css class to add the rigth sidebar but to no avail.</p>
  
  <p>Any help will be appreciated.</p>
  
  <p>Thanks.</p>