gistfile1.txt

document.addEventListener('click', (e) => {
  const color = getColor(e);
  document.body.style.backgroundColor = color;
})

const getColor = (event) => {
  const {clientX, clientY} = event;
  if (clientX % 2 == 0) {
    return clientY % 2 == 0 ? "red" : "green";
  } else {
    return clientY % 2 == 0 ? "green" : "blue";
  }
};