title: Very long (horizontaly) dropdown navigation menu jQuery issue
body: <p>I'm trying to create a long dropdown nav bar. The HTML structure is the following:</p>
  
  <pre><code> &lt;div id='cssmenu'&gt;
      &lt;ul&gt;
          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Home&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Products&lt;/span&gt;&lt;/a&gt;
              &lt;ul&gt;
                  &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Product 1&lt;/span&gt;&lt;/a&gt;
                      &lt;ul&gt;
                          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Sub Item&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Sub Item&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
                      &lt;/ul&gt;
                  &lt;/li&gt;
                  &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Product 2&lt;/span&gt;&lt;/a&gt;
                      &lt;ul&gt;
                          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Sub Item&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
                          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Sub Item&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
                      &lt;/ul&gt;
                  &lt;/li&gt;
              &lt;/ul&gt;
          &lt;/li&gt;
          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;About&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a href='#'&gt;&lt;span&gt;Contact&lt;/span&gt;&lt;/a&gt;&lt;/li&gt;
      &lt;/ul&gt;
   &lt;/div&gt;
  </code></pre>
  
  <p>Visually it looks like this, but for now,</p>
  
  <p><strong>I'd like to add those red arrows for a horizontal scroll/slide the root <code>&lt;li&gt;</code> elements</strong>:</p>
  
  <p><img src="https://i.stack.imgur.com/2hvHr.jpg" alt="enter image description here"></p>
  
  <p>The <strong>demo</strong> of navbar with css is here: <a href="http://cssmenumaker.com/builder/800017" rel="nofollow noreferrer">http://cssmenumaker.com/builder/800017</a></p>
  
  <p>I have searched up the web but still could not find any solutions. If somebody has some ideas please share. Thank you!</p>