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                click anywhere to test

<div class="animContainerL animL1" style='top: 30%'></div>
<div class="animContainerR animR1" style='top: 30%'></div>

<div class="animContainerL animL2" style='top: 45%'></div>
<div class="animContainerR animR2" style='top: 45%'></div>

<div class="animContainerL animL3" style='top: 60%'></div>
<div class="animContainerR animR3" style='top: 60%'></div>


                * {
  margin: 0;

.animContainerR {
  background-color: black;

.animContainerR {
  background-color: red;


                let allSets = [['.animL1', '.animR1'], ['.animL2', '.animR2'], ['.animL3', '.animR3']];

function timeLine(elements, options) {

  options = options || {};
  let duration = options.duration || 0.2;
  let stagger = (options.stagger == null) ? 0.3 : options.stagger || 0;
  let tl = new TimelineLite({onComplete:()=> console.log('done')});
  elements.forEach((element, i) => {
    let endX = random(window.innerWidth / 2, 0);, duration, {
        x: function(index, element) {
          return element.classList.contains('animContainerR') ? window.innerWidth - endX : endX;
      }, stagger * i);
  return tl;

window.addEventListener('click', function(e) { timeLine(allSets, {stagger:0.3, duration:0.5}) });

function random(min, max) {
  return Math.random() * (max - min) + min;