quick intro animation for multiple staggered elements

intro.js

/*
.orc {
  transition: top 1s ease 0s;
  position: relative;
  top: -3000px;

  &.shown {
    top: 0;
  }
}
*/

for (let orc of document.getElementsByClassName('orc')) {
  orc.classList.add('shown')
  await this.sleep(this.getRandomIntegerInRange(50, 400))
}