app.js

addEventListener('load', () => {
  function callApi() {
    fetch('https://api.quotable.io/random')
      .then((res) => {
        return res.json();
      })
      .then((data) => {
        document.getElementById('quote').innerHTML = data.content;
        document.getElementById('author').innerHTML = data.author;
      })
      .catch((err) => console.log(err));
  }

  callApi();
});

function setbackground() {
  window.setTimeout('setbackground()', 5000); //  milliseconds delay

  var index = Math.round(Math.random() * 9);

  var ColorValue = 'FFFFFF'; // default color - white (index = 0)

  if (index == 1) ColorValue = '66FF33';
  if (index == 2) ColorValue = 'FF0000';
  if (index == 3) ColorValue = 'FF00FF';
  if (index == 4) ColorValue = '0000FF';
  if (index == 5) ColorValue = '00FFFF';
  if (index == 6) ColorValue = 'FFFF00';
  if (index == 7) ColorValue = 'CC66FF';
  if (index == 8) ColorValue = '3366FF';
  if (index == 9) ColorValue = 'CCCCCC';

  document.getElementsByTagName('body')[0].style.backgroundColor =
    '#' + ColorValue;
}