title: Can I have my header's background color fade in as the page scrolls down
body: <p>First off, here's my website: <a href="http://andrewdurano.com" rel="nofollow">my website</a></p>
  
  <p>I was hoping to get some feedback on how to have my header's background color (light grey) fade from 0 opacity to 100% as the page gets scrolled down. Maybe right before the first project hits the header, the grey background will have appeared already.</p>
  
  <p>On my project pages, you can see that the sidebar description fades after a certain point. I want that for my header, but not the whole div to be invisible at first, but just the background color.</p>
  
  <p>Cheers!</p>