Top Navigation disappears with the scroll <p>I would like to create a navigation menu with the top bar that disappears with the scroll. An example is <a href="http://preview.oklerthemes.com/porto/2.7.0/" rel="nofollow">this</a> </p> <p>As you can see in this theme, the menu continues to be high but the upper div disappears.</p> <p>How could I do? <strong>Thanks</strong> in advance to all</p> <p>PS: I'm using bootstrap 3</p>