function setup() {
  createCanvas(windowWidth,
               windowHeight);
  background(234, 234, 234);
}

function draw() {
  
var from = color(25,25,112,90);
  var to = color(169,169,169,90);
  stroke(255, 160);
  fill(lerpColor(from, to, random(3.0)));
  rect(random(width), random(height), 80, 80);
}