title: Sticky NavBar onScroll?
body: <p>I'm currently building a site for myself, and I found this really awesome effect on multiple sites where the navbar is below an image, but when you scroll past it, it sticks to the top.</p>
  
  <p><a href="http://www.littleco.com/" rel="nofollow">Example</a></p>
  
  <p>How can I achieve this? Also, how can I achieve an effect similar to the one on <a href="http://riotdesign.eu/en/" rel="nofollow">this website with a similar navbar style</a>?</p>