let x2off = 10.0;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(204);

  x1off = x1off + 0.01;

  x2off = x2off + 0.01;

  let n = noise(x1off) * width;

  let m = noise(x2off) * width;

  line(m, 0, n, height);

  fill(m+30,80,n+50,150)

  quad(m,0,n,height,0,height,0,0)

  fill(80,m+30,n,150)

  quad(m,0,n,height,width,height,width,0)

}

​