import { createTimeline } from 'animejs';

const tl = createTimeline({
  defaults: {
    ease: 'inOutExpo',
    duration: 500,
    loop: 2,
    reversed: true,
    alternate: true,
  }
})
.add('.square', { x: '15rem' })
.add('.circle', { x: '15rem' })
.add('.triangle', { x: '15rem' });

<div class="large row">
  <div class="medium pyramid">
    <div class="triangle"></div>
    <div class="square"></div>
    <div class="circle"></div>
  </div>
</div>