1function generateRandomColor() {
2  var letters = '0123456789ABCDEF';
3  var color = '#';
4  for (var i = 0; i < 6; i++) {
5    color += letters[Math.floor(Math.random() * 16)];
6  }
7  return color;
8}
9
10var randomColor=generateRandomColor();//"#F10531"

1const setBg = () => {
2  const randomColor = Math.floor(Math.random()*16777215).toString(16);
3  document.body.style.backgroundColor = "#" + randomColor;
4  color.innerHTML = "#" + randomColor;
5}
6
7genNew.addEventListener("click", setBg);
8setBg();

1Math.floor(Math.random()*16777215).toString(16);