<body>
  <div class="container">
    <div class="outer">
      <div class="inner"></div>
    </div>
    <div class="range">
      <label for="perspective">Perspective</label>
      <input type="range" class='perspective' id="perspective" step=1 min=5 max=500 value=250>
      <span class='per-text'></span>
      <label for="degree">Degree</label>
      <input type="range" class="degree" id='degree' step=1 min=0 max=360 value=180>
      <span class='deg-text'></span>
    </div>
  </div>
</body>
body {
  width: 100%;
  margin: 0;
  padding: 0;
}
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 2rem;
}
.outer,
.inner {
  width: 10rem;
  height: 10rem;
}
.outer {
  border: 1px solid black;
}
.inner {
  border: 1px solid red;
  background: red;
  opacity: 0.5;
  transform: rotateY(45deg);
}
.range {
  width: 18rem;
  text-align: center;
}

const outer = document.querySelector(".outer");
const inner = document.querySelector(".inner");
const perspective = document.querySelector(".perspective");
const perspectiveText = document.querySelector(".per-text");
const degree = document.querySelector(".degree");
const degreeText = document.querySelector(".deg-text");

perspective.addEventListener("input", (e) => {
  outer.style.perspective = e.target.value + "rem";
  perspectiveText.innerText = e.target.value + "rem";
});
degree.addEventListener("input", (e) => {
  inner.style.transform = `rotateY(${e.target.value}deg)`;
  degreeText.innerText = e.target.value + "deg";
});

window.addEventListener("load", () => {
  perspectiveText.innerText = perspective.value + "rem";
  degreeText.innerText = degree.value + "deg";
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.