title: jquery change background color user scroll
body: <p>Is it possible with jquery that when a user scrolls down the page that the background animate from 50% white to 90% white or someting?</p>
  
  <p>So first it is the color <code>rgba(255,255,255,.5)</code> and when a user scroll 210px below the color <code>become rgba(255,255,255,.9)</code>.</p>