​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  pickerBackground = createColorPicker(color(0));

  pickerBackground.position(10, height / 2 - 20);

  pickerBackground.style("width", width - 20 + "px");

}

​

function draw() {

  let backgroundColor = pickerBackground.color();

  background(backgroundColor);

}

​