function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(432, 123, 356);

}



function draw() {

  var from = color(0, 128, 255);

  var to = color(111, 222, 333);



  noStroke();



  for (var i = 0.0; i < width; i = i + 20.0) {

    stroke(lerpColor(from, to, i / width));

    strokeWeight(i / 100);

    line(i, 0, i, height);

  }

}