text: const hex = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'A', 'B', 'C', 'D', 'E', 'F'];
  const btn = document.getElementById('btn');
  const color = document.querySelector('.color');
  
  btn.addEventListener('click', function() {
      let hexColor = '#';
      for (let i = 0; i < 6; i++) {
          hexColor += hex[getRandomNumber()];
      }
      color.textContent = hexColor;
      document.body.style.backgroundColor = hexColor;
  });
  
  function getRandomNumber() {
      return Math.floor(Math.random() * hex.length);
  }