// You don't need this part. 
// It's only for this Codepen
const backgroundImgs = [
  "https://images.unsplash.com/photo-1618005198919-d3d4b5a92ead?q=80&w=1974&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D",
  "https://images.unsplash.com/photo-1659952586072-b3cebadec6d2?q=80&w=1932&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D",
  "https://images.unsplash.com/photo-1650646002393-9d057933cf89?q=80&w=2070&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D",
  "https://images.unsplash.com/photo-1576225410873-a28b2a79fd93?q=80&w=2070&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D",
  "https://images.unsplash.com/photo-1552083375-1447ce886485?q=80&w=2070&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D",
];
let counter = 0;

document.getElementById("change-bg").addEventListener("click", () => {
  counter = counter === backgroundImgs.length -1 ? 0 : counter + 1;
  const randomImg = backgroundImgs[counter];
  document.body.style.backgroundImage = `url(${randomImg})`;
});