let sliderRed;

let sliderGreen;

let sliderBlue;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  buttonBackground = createButton("Change Background");

  buttonBackground.mousePressed(changeBackground);

​

  sliderRed = createSlider(0, 255, 0);

  sliderRed.position(10, 10);

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

​

  sliderGreen = createSlider(0, 255, 0);

  sliderGreen.position(10, 60);

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

​

  sliderBlue = createSlider(0, 255, 0);

  sliderBlue.position(10, 110);

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

}

​

function draw() {

  let valR = sliderRed.value();

  let valG = sliderGreen.value();

  let valB = sliderBlue.value();

​

  background(valR, valG, valB);

​

  buttonBackground.position(10, 150);

}

​

function changeBackground() {

  sliderRed.value(random(255));

  sliderGreen.value(random(255));

  sliderBlue.value(random(255));

}

​