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HTML 

              
                
    <div class="container gradient-bg">
      <div class="threedee-container">
        <div class="box background"></div>

        <div class="box back">
          <div class="content grid-content">
            <p class="body">
              This is a fun little 3D card using JS to modulate CSS custom
              properties on mouse move and frame number with some constraints.
            </p>
          </div>
        </div>

        <div class="box middle">
          <div class="content grid-content">
            <button class="action">3D-ify</button>
          </div>
        </div>

        <div class="box front">
          <div class="content grid-content">
            <h2 class="title">3D Card</h2>
          </div>
        </div>
      </div>
    </div>
    <!--<script src="main.js"></script>-->
!

CSS 

              
                html,
body {
  margin: 0;
  background-color: rgb(28, 17, 42);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  overflow: hidden;
}

body {
  --primary-highlight-400: hsl(178, 88%, 53%);
  --primary-highlight-500: hsl(178, 88%, 38%);
  --secondary-highlight-300: hsl(358, 88%, 71%);
  --secondary-highlight-400: hsl(358, 88%, 53%);
  --secondary-highlight-500: hsl(358, 88%, 38%);

  --primary-white-500: hsla(0, 0%, 100%, 0.9);
  --primary-white-400: hsla(0, 0%, 100%, 0.8);
  --primary-white-300: hsla(0, 0%, 100%, 0.6);
  --primary-white-200: hsla(0, 0%, 100%, 0.3);
  --primary-white-150: hsla(0, 0%, 100%, 0.05);
  --primary-white-100: hsla(0, 0%, 100%, 0);

  --primary-black-300: rgba(0, 0, 0, 0.3);
  --primary-black-200: rgba(0, 0, 0, 0.2);
  --primary-black-100: rgba(0, 0, 0, 0.1);

  --action-glow-spread-400: 1rem;
  --action-glow-spread-500: 2rem;
}

h1,
h2,
h3,
p,
button {
  all: unset;
  font-family: inherit;
  font-size: inherit;
}

.container {
  --bg-gradient-angle: 0deg;
  --bg-gradient-hue-start: 299;
  --bg-gradient-hue-end: 29;
  display: grid;
  justify-content: center;
  align-items: center;

  inline-size: 100vw;
  block-size: 100vh;
  block-size: 100dvh;
}

.gradient-bg {
  background-image: radial-gradient(
      circle at center,
      var(--primary-white-100),
      var(--primary-black-200)
    ),
    linear-gradient(
      var(--bg-gradient-angle),
      hsl(var(--bg-gradient-hue-start), 54%, 19%),
      hsl(var(--bg-gradient-hue-end), 56%, 19%)
    );
}

.threedee-container {
  --perspective: 2000px;

  --x-rotate: 0deg;
  --y-rotate: 0deg;
  --z-rotate: 0deg;

  --stack-scale: 1rem;

  --blur: 0;

  --glass-rotation: 67deg;
  --glass-stop-start: 30%;
  --glass-stop-middle: 50%;
  --glass-stop-end: 70%;
  --glass-alpha-low: 0;
  --glass-alpha-high: 1;

  perspective: var(--perspective);
}

.box {
  position: absolute;

  inline-size: 20rem;
  block-size: 20rem;

  border: 0.5px solid var(--primary-black-100);
  border-radius: 1rem;
  background-color: var(--primary-white-150);
  background-image: linear-gradient(
    var(--glass-rotation),
    rgba(255, 255, 255, var(--glass-alpha-low)) var(--glass-stop-start),
    rgba(255, 255, 255, var(--glass-alpha-high)) var(--glass-stop-middle),
    rgba(255, 255, 255, var(--glass-alpha-low)) var(--glass-stop-end)
  );
}

.background {
  background-image: linear-gradient(
    148deg,
    hsla(267, 20%, 20%, 0.6),
    hsla(340, 20%, 30%, 0.6)
  );

  transform: translate(-50%, -50%) scale(1.1) rotateX(var(--x-rotate))
    rotateY(var(--y-rotate)) rotateZ(var(--z-rotate))
    translateZ(calc(var(--stack-scale) * -1));
}

.back {
  pointer-events: none;

  transform: translate(-50%, -50%) rotateX(var(--x-rotate))
    rotateY(var(--y-rotate)) rotateZ(var(--z-rotate))
    translateZ(calc(var(--stack-scale) * 0));

  filter: blur(var(--blur));
}

.middle {
  transform: translate(-50%, -50%) rotateX(var(--x-rotate))
    rotateY(var(--y-rotate)) rotateZ(var(--z-rotate))
    translateZ(calc(var(--stack-scale) * 1));

  filter: blur(var(--blur));
}

.front {
  pointer-events: none;

  transform: translate(-50%, -50%) rotateX(var(--x-rotate))
    rotateY(var(--y-rotate)) rotateZ(var(--z-rotate))
    translateZ(calc(var(--stack-scale) * 2));

  filter: blur(var(--blur));
}

.content {
  padding: 1rem;
}

.grid-content {
  display: grid;
  grid-template-areas:
    "title title title title"
    "text text text text"
    "text text text text"
    "action action action action";
  grid-template-rows: repeat(4, 1fr);

  block-size: 100%;
}

.title {
  grid-area: title;
  align-self: center;

  margin: 0;

  font-weight: 100;
  font-size: 3rem;

  color: var(--primary-highlight-400);
}

.body {
  grid-area: text;

  font-size: 1.2rem;
  line-height: 1.5;
  font-weight: 300;

  color: var(--primary-white-400);
}

.action {
  cursor: pointer;
  outline: none;

  padding: 1rem 2rem;

  text-transform: uppercase;
  font-size: 0.85rem;

  grid-area: action;
  justify-self: end;
  align-self: start;

  color: rgba(0, 0, 0, 0.6);
  background-color: var(--primary-highlight-400);
  border: 0.5px solid var(--primary-black-200);
  border-radius: 5px;
  box-shadow: 0 0 var(--action-glow-spread-400) 0 var(--primary-white-100);

  transition: background-color 150ms ease-in-out, color 150ms ease-in-out,
    box-shadow 500ms ease-in-out, border 500ms ease-in-out;
}

.action:is(:hover, :focus) {
  color: var(--primary-white-400);
  background-color: var(--primary-highlight-500);
  border: 0.5px solid var(--secondary-highlight-400);
  box-shadow: 0 0 var(--action-glow-spread-400) 0 var(--primary-white-300);
}

.action:active {
  color: var(--primary-white-500);
  border: 0.5px solid var(--secondary-highlight-300);
  box-shadow: 0 0 var(--action-glow-spread-500) 0 var(--primary-white-400);

  transition: box-shadow 75ms ease-in-out;
}
!

JS 

              
                (function () {
  let width, height;

  // set initial sizing
  height = window.innerHeight;
  width = window.innerWidth;

  // For the devs who like to mess with the screen ;)
  window.addEventListener("resize", () => {
    height = window.innerHeight;
    width = window.innerWidth;
  });

  // In this example, we just grab the mouse for some animation fun
  let screenX, screenY;
  let endDelta = {x: 0, y: 0};
  let startDelta = {x: 0, y: 0};
  document.addEventListener("mousemove", (e) => {
    const { x, y } = e;
    screenY = y / height;
    screenX = x / width;
  });

  // Adding some touch events for mobile functionality... comming soon, need to get my head around it. :/
  window.addEventListener("touchmove", (e) => {
    const touch = e.touches[0];
    const { clientX: x, clientY: y } = touch;
    screenY = y / height;
    screenX = x / width;
  });
  
  window.addEventListener("touchstart", (e) => {
    const touch = e.touches[0];
    const {clientX: x, clientY: y} = touch
    startDelta = {x, y};
  })
  
  window.addEventListener("touchend", (e) => {
    const touch = e.touches[0];
    const {clientX: x, clientY: y} = touch
    endDelta = {x, y};
  })

  const containerHandle = document.querySelector(".container");
  const cardHandle = document.querySelector(".threedee-container");

  // Little helper to register and set css properties for html element styles
  function cssPropertyModifier(element) {
    const propertyControllers = [];

    function registerProperties(...propsTuple) {
      propsTuple.forEach((propTuple) => propertyControllers.push(propTuple));
    }
    function setProperties(t) {
      const styleString = propertyControllers.reduce((str, controller) => {
        return (str += `${controller[0]}:${controller[1](t)};`);
      }, "");
      element.style = styleString;
    }
    return {
      registerProperties,
      setProperties
    };
  }

  // Helper to set some sensible boundaries, assumes 0 <= t <= 1
  const boundaries = (min = 0, max = 1, t = 0) => {
    return min + t * (max - min);
  };

  // Lots of secret nunbers – this is the creative bit. Animate all the things!
  // Property Modifier Tuple – [css-property-name, frame-number => do fun stuff here...]
  // Make sure the units returned by the modifier function make sense to css

  const onMouseMoveColorCycle = cssPropertyModifier(containerHandle);
  onMouseMoveColorCycle.registerProperties(
    [
      "--bg-gradient-angle",
      (t) => `${boundaries(-60, 167, Math.sin(t / 500))}deg`
    ],
    [
      "--bg-gradient-hue-start",
      (t) =>
        `${boundaries(279, 330 + 45 * Math.cos(t / 300), screenX * screenY)}`
    ],
    [
      "--bg-gradient-hue-end",
      (t) => `${boundaries(10 + 30 * Math.sin(t / 400), 70, screenX * screenY)}`
    ]
  );

  const onMouseMoveRotate = cssPropertyModifier(cardHandle);
  onMouseMoveRotate.registerProperties(
    ["--x-rotate", () => `${boundaries(-35, 35, screenY)}deg`],
    ["--y-rotate", () => `${boundaries(35, -35, screenX)}deg`],
    ["--blur", () => `${boundaries(0, 0.6, Math.pow(2 * screenX - 1, 2))}px`],
    [
      "--glass-rotation",
      (t) =>
        `${boundaries(
          -12,
          95 - 22 * Math.sin(t / 120),
          Math.pow(2 * screenX - 1, 3)
        )}deg`
    ],
    [
      "--glass-alpha-low",
      () => `${boundaries(0, 0.03, Math.pow(2 * screenX - 1, 2))}`
    ],
    [
      "--glass-alpha-high",
      () => `${boundaries(0.1, 0.04, Math.pow(2 * screenX - 1, 2))}`
    ],
    [
      "--glass-stop-start",
      () => `${boundaries(4, 20, Math.pow(2 * screenX - 1, 2))}%`
    ],
    [
      "--glass-stop-middle",
      () => `${boundaries(20, 90, Math.pow(2 * screenX - 1, 2))}%`
    ],
    [
      "--glass-stop-end",
      () => `${boundaries(8, 110, Math.pow(2 * screenX - 1, 2))}%`
    ]
  );

  // Build Animator initalised with functions to animate then returns an updater
  // update takes a frame limit (perf maybe?) and returns an animation cancel (reduce motion?)

  function buildAnimator(...fns) {
    let frame = 0;
    return function update(frameLimit = 1) {
      if (frame % frameLimit === 0) {
        fns.forEach((fn) => {
          fn(frame);
        });
      }
      frame = requestAnimationFrame(() => update(frameLimit));
      return function cancel(
        cleanUp = ({ frame, fns }) =>
          console.info("animation cancelled", { frame, fns })
      ) {
        // pass in some clean up actions
        cancelAnimationFrame(frame);
        cleanUp({ frame, fns });
      };
    };
  }

  // Animate the things!
  const update = buildAnimator(
    onMouseMoveRotate.setProperties,
    onMouseMoveColorCycle.setProperties
  );

  // Set frame limiting, run animator fns every "n" RAF's
  const cancel = update(4);
})();
!
999px

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