import { animate } from 'animejs';

const $demo = document.querySelector('#selector-demo');
const $squares = $demo.querySelectorAll('.square');

animate($demo, { scale: .75 });
animate($squares, { x: '23rem' });

<div id="selector-demo">
  <div class="medium row">
    <div class="square"></div>
  </div>
  <div class="medium row">
    <div class="square"></div>
  </div>
  <div class="medium row">
    <div class="square"></div>
  </div>
</div>