title: 3-column full screen app layout in Bootstrap 3
body: <p>I'm creating an admin dashboard for an app, where I need a layout like this:</p>
  
  <pre><code>---------------------------------------------------------------------------------
  |                                                                               |
  |                              NAVBAR                                           |
  ---------------------------------------------------------------------------------
  |        |                                                  |                   |
  |   N    |                                                  |                   |
  |   A    |                                                  |                   |
  |   V    |                                                  |                   |
  |   I    |                                                  |                   |
  |   G    |                                                  |                   |
  |   A    |                                                  |                   |
  |   T    |                      MAIN VIEW                   |       SUB         |
  |   I    |                                                  |       VIEW        |
  |   O    |                                                  |                   |
  |   N    |                                                  |                   |
  |        |                                                  |                   |
  |        |                                                  |                   |
  |        |                                                  |                   |
  |        |                                                  |                   |
  ---------------------------------------------------------------------------------
  </code></pre>
  
  <p>The width and height should be 100% of the entire viewport. I tried to do it by fixing the top navbar using <code>.navbar-fixed-top</code>, <code>position: absolute</code> for the side navigation and fixing the heights for the main and sub views using media queries for different screen sizes. But I am looking for a better, cleaner solution. How can I do it?</p>