function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(234, 234, 23);

}



function draw() {

  var from = color(0, 682, 255);

  var to = color(654,  100, 150);



  for (var i = 0.0; i < width; i = i + 30.0) {

    for (var j = 0.0; j < height; j = j + 30.0) {

      stroke(238);

      fill(lerpColor(from, to, (i + j) / (width + height)));

      rect(i, j, 15, 30);

    }



  }

}