title: How can I fix the bootstrap navbar to the top after a div was scrolled?
body: <p>I am trying to get my navbar with bootstrap to appear after a certain div, called "A". Div "a" is at the top of by page, and has a height of around 400px. Once the user scrolls past the div "a" and the scrollbar, I want the scroll bar to stick to the top. Similar to something like this: <a href="https://www.facebook.com/home">https://www.facebook.com/home</a> but I don't have a video at the top, it is an image.</p>
  
  <p>Can we do that we bootstrap itself?</p>
  
  <p>Thanks!</p>