Disco the Google

/**
 *  How to use:
 *  1. Open google.com
 *  2. Open Developer console (CTRL+SHIFT+J then choose "console")
 *  3. Paste this entire script and enter
 *  Enjoy!
 */

const el = document.body;

function test() {
    return new Promise(resolve => {
        setTimeout(() => {
            el.style.backgroundColor = '#' + (Math.floor(Math.random() * 0xffffff)).toString(16);
            resolve();
        }, 1000/30);
    }).then(test);
}

test();

const el_foot = document.getElementById('fbar');

function test_foot() {
    return new Promise(resolve => {
        setTimeout(() => {
            el_foot.style.backgroundColor = '#' + (Math.floor(Math.random() * 0xffffff)).toString(16);
            resolve();
        }, 1000/30);
    }).then(test_foot);
}

test_foot();