title: How to fade text out vertically, similar to Amazon's product descriptions
body: <p>I am trying to to fade a block of text from black on the first line to light grey on the last line. I noticed that Amazon does this with their product description. I tried looking at the CSS code and I couldn't see anything there, I suspect it is achieved with javascript. </p>
  
  <p>My question is: How would I go about emulating a similar vertical fading effect on a textblock of my own?</p>