​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  buttonBackground = createButton("Change Background");

  buttonBackground.mousePressed(changeBackground);

}

​

function draw() {

  let x = (frameCount / 4) % (width / 2);

  let y = (frameCount / 4) % (height - 20);

  buttonBackground.position(x, y);

}

​

function changeBackground() {

  background(random(255), random(255), random(255));

}

​