title: What is rgb formula for a gradient going from white to blue?
body: <p>I want to have a button that has numbers in the range 0 ... 255. I'd like the color of the button to be white when it's zero and blue (RGB = (0,0,255)) when it is 255. How can I accomplish this? At first I tried to make it RGB = (0,0,0) in the beginning, but it will only make it black.</p>
  
  <p>How can I accomplish this?</p>