title: vertical menu with submenu in bootstrap material design
body: <p>It is getting like this now</p>
  
  <p><a href="https://jsfiddle.net/nax4ryL1/" rel="nofollow noreferrer">https://jsfiddle.net/nax4ryL1/</a></p>
  
  <p>I want to get it as like this below image</p>
  
  <p><a href="https://i.stack.imgur.com/3bDPG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3bDPG.jpg" alt="enter image description here"></a>
  how to get it like this tabular submenu while hovering each vertical menu which should be above the banner image?</p>
  
  <pre><code>&lt;div class="container"&gt;
        &lt;div class="row"&gt;
          &lt;div class="col-sm-2"&gt;
            &lt;ul class="vertical-nav"&gt;
              &lt;li&gt;&lt;a href=""&gt;Link 1&lt;/a&gt;&lt;/li&gt;
              &lt;li&gt;&lt;a href=""&gt;Link 2&lt;/a&gt;
                  &lt;div class='sub-menu'&gt;
                &lt;ul class="column"&gt;
                    &lt;li class='title'&gt;Style&lt;/li&gt;
                    &lt;li&gt;&lt;a href="#"&gt;Sub Link 1&lt;/a&gt;&lt;/li&gt;
                    &lt;li&gt;&lt;a href="#"&gt;Sub Link 2&lt;/a&gt;&lt;/li&gt;
                  &lt;/ul&gt;
                   &lt;ul class='column'&gt;
                    &lt;li class='title'&gt;Subject&lt;/li&gt;
                    &lt;li&gt;&lt;a href="#"&gt;Sub Link 3&lt;/a&gt;&lt;/li&gt;
                    &lt;li&gt;&lt;a href="#"&gt;Sub Link 4&lt;/a&gt;&lt;/li&gt;
                  &lt;/ul&gt;
                   &lt;ul class='column'&gt;
                    &lt;li class='title'&gt;Medium&lt;/li&gt;
                    &lt;li&gt;&lt;a href="#"&gt;Sub Link 5&lt;/a&gt;&lt;/li&gt;
                    &lt;li&gt;&lt;a href="#"&gt;Sub Link 6&lt;/a&gt;&lt;/li&gt;
                &lt;/ul&gt;
                  &lt;/div&gt;
              &lt;/li&gt;
            &lt;/ul&gt;
          &lt;/div&gt;
          &lt;div class="col-sm-10"&gt;
          &lt;img src="images/banner.jpg" class="img-responsive"&gt;
          &lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
  </code></pre>