<div class="scene">
  <div class="item a"></div>
  <div class="item b"></div>
  <div class="item c"></div>
</div>
body {
  height: 100vh;
  margin: 0;
}

.scene {
  position: relative;
  width: 100vw;
  transform-style: preserve-3d;
  perspective: 4vw;
  perspective-origin: 50vw 50vh;
}

.item {
  position: absolute;
  left: 50vw;
  top: 50vh;
  width: 10vh;
  height: 10vh;
  background: blue;
  border: 1px solid #ccc;
}
.item.a {
  transform: translate3d(2vw, 2vh, 1vh);
}
.item.b {
  transform: translate3d(4vw, 6vh, 2vh);
}
.item.c {
  transform: translate3d(8vw, -2vh, 4vh);
}
/**
 * для вопроса https://qna.habr.com/q/971293
 * Как называется такая анимация, и как ее делать вне конструкторов?
 */
window.addEventListener("mousemove", parallax);
const scene = document.querySelector("div.scene");

function parallax(e) {
  const x = window.innerWidth - e.pageX;
  const y = window.innerHeight - e.pageY;

  scene.style.perspectiveOrigin = `${x}px ${y}px`;
}

External CSS

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External JavaScript

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