function setup() {

  createCanvas(windowWidth, windowHeight);

  background("white");

  let squareColors = ["#EBEDF0", "#9CE9A8", "#40C463", "#30A14F", "#216E39"];

  let squareSize = 10;

  for (let i = 0; i < width; i+= (squareSize + 5)) {

    for (let j = 0; j < height; j+= (squareSize + 5)) {

      let ci = floor(random(5));

      fill(squareColors[ci]);

      rect(i, j, squareSize)

    }

  }

}

​

function draw() {

}