Code is beautiful

let yOffset = 0;

function setup() {
  let cnv = createCanvas(windowWidth, windowHeight);
  cnv.parent("p5-container");
  noStroke();
  fill(0, 119, 190, 100);
}

function draw() {
  background(240);
  beginShape();
  let xOffset = 0;
  for (let x = 0; x <= width; x += 10) {
    let y = map(noise(xOffset, yOffset), 0, 1, height / 2 - 100, height / 2 + 100);
    vertex(x, y);
    xOffset += 0.02;
  }

  vertex(width, height);
  vertex(0, height);
  endShape(CLOSE);
  yOffset += 0.01;
}