text: const btn = document.getElementById("btn");
  const boxes = document.getElementById("boxes");
  
  btn.addEventListener("click", () => boxes.classList.toggle("big"));
  
  function createBoxes() {
      for (let i = 0; i < 4; i++) {
          for (let j = 0; j < 4; j++) {
              const box = document.createElement("div");
              box.classList.add("box");
              box.style.backgroundPosition = `${-j * 125}px ${-i * 125}px`;
              boxes.appendChild(box);
          }
      }
  }
  
  createBoxes();
  