function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(0, 0, 0,200);

}



function draw() {

  var from = color(10, 0, 255, 70);

  var to = color(255, 128, 0, 80);



  stroke(255, 255,255,255);

  fill(lerpColor(from, to, random(2.0)));

  rect(random(width), random(height), 50, 50);

}