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HTML

              
                <body class="dial">
  <main>
    <div class="r">
      <div class="safe">
        <h1>Crack the Safe</h1>
        <div class="box">
          <div class="innerdial">
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="mark"></div>
            <div class="center">
              <div class="start"></div>
            </div>
          </div>
          <div class="box-flash"></div>
        </div>
        <div class="position">0</div>
        <p>Scroll up and down to find the combination. Stop on a number to "listen" for a click. Dark green means you're close, bright green means you got one. Scroll all the way to the top to reset.</p>
        <div class="chalkboard"></div>
        <div class="hint">
          53
          22
          79
        </div>
      </div>
    </div>
  </main>
  <div class="winner">Winner</div>
</body>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=Homemade+Apple&family=Rock+Salt&display=swap");

:root {
  --scroll: 0;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
}

main {
  height: 100vh;
}

.r {
  min-height: 10000px;
}

.safe {
  top: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: #444;
  z-index: 2;
}

.safe h1 {
  font-family: "Rock Salt";
  color: white;
}

.safe p {
  font-size: 0.9em;
  line-height: 1.5em;
  font-family: "Rock Salt";
  max-width: 250px;
  text-align: justify;
  color: white;
}

div.winner {
  width: 100vw;
  height: 100vh;
  background-color: green;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8em;
  font-family: "Rock Salt";
  color: white;
  z-index: 1;
}

div.box {
  width: 250px;
  height: 250px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(calc(var(--scroll) * 0.08deg));
  transform-origin: center;
}

div.innerdial {
  position: absolute;
  top: 0;
  left: 0;
  width: 250px;
  height: 250px;
  z-index: 2;
  background-color: silver;
  border: 1px solid black;
  border-radius: 50%;
}

div.box-flash {
  position: absolute;
  top: 0;
  left: 0;
  width: 250px;
  height: 250px;
  transform: scale(1);
  background-color: silver;
  border-radius: 50%;
  opacity: 0.9;
  z-index: -1;
}

.click {
  animation: click 0.2s 1;
}

.near {
  animation: near 0.2s 1;
}

.off {
  animation: off 0.2s 1;
}

@keyframes click {
  0% {
    background-color: lime;
    transform: scale(1);
    opacity: 1;
  }
  100% {
    background-color: lime;
    transform: scale(1.5);
    opacity: 0;
  }
}

@keyframes near {
  0% {
    background-color: green;
    transform: scale(1);
    opacity: 0.5;
  }
  100% {
    background-color: green;
    transform: scale(1.3);
    opacity: 0;
  }
}

@keyframes off {
  0% {
    transform: scale(1);
    opacity: 0.25;
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
  }
}

div.mark {
  position: absolute;
  top: 122px;
  left: 115px;
  width: 20px;
  height: 6px;
  background-color: grey;
  border: 1px solid black;
}

div.mark:nth-of-type(1) {
  transform: rotate(calc(22.5deg * 0)) translateX(100px);
}
div.mark:nth-of-type(2) {
  transform: rotate(calc(22.4deg * 1)) translateX(100px);
}
div.mark:nth-of-type(3) {
  transform: rotate(calc(22.5deg * 2)) translateX(100px);
}
div.mark:nth-of-type(4) {
  transform: rotate(calc(22.5deg * 3)) translateX(100px);
}
div.mark:nth-of-type(5) {
  transform: rotate(calc(22.5deg * 4)) translateX(100px);
}
div.mark:nth-of-type(6) {
  transform: rotate(calc(22.5deg * 5)) translateX(100px);
}
div.mark:nth-of-type(7) {
  transform: rotate(calc(22.5deg * 6)) translateX(100px);
}
div.mark:nth-of-type(8) {
  transform: rotate(calc(22.5deg * 7)) translateX(100px);
}
div.mark:nth-of-type(9) {
  transform: rotate(calc(22.5deg * 8)) translateX(100px);
}
div.mark:nth-of-type(10) {
  transform: rotate(calc(22.5deg * 9)) translateX(100px);
}
div.mark:nth-of-type(11) {
  transform: rotate(calc(22.5deg * 10)) translateX(100px);
}
div.mark:nth-of-type(12) {
  transform: rotate(calc(22.5deg * 11)) translateX(100px);
}
div.mark:nth-of-type(13) {
  transform: rotate(calc(22.5deg * 12)) translateX(100px);
}
div.mark:nth-of-type(14) {
  transform: rotate(calc(22.5deg * 13)) translateX(100px);
}
div.mark:nth-of-type(15) {
  transform: rotate(calc(22.5deg * 14)) translateX(100px);
}
div.mark:nth-of-type(16) {
  transform: rotate(calc(22.5deg * 15)) translateX(100px);
}

div.center {
  position: absolute;
  top: 50px;
  left: 50px;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background-color: grey;
  border: 1px solid black;
}

div.start {
  position: absolute;
  top: 70px;
  left: 65px;
  width: 20px;
  height: 10px;
  background-color: white;
  transform: rotate(-90deg) translateX(60px);
}

.position {
  position: relative;
  margin-top: 5px;
  text-align: center;
  padding: 3px;
  min-width: 24px;
  border: 1px solid black;
  background-color: #fff;
  font-family: monospace;
  color: #888;
}

.chalkboard {
  position: absolute;
  left: 15vw;
  top: 50vh;
  padding: 20px;
  font-size: 4em;
  font-family: "Homemade Apple";
  transform: rotate(15deg);
  white-space: pre;
  line-height: 1em;
  color: #ffffff;
}

.hint {
  position: absolute;
  right: 20px;
  bottom: 20px;
  padding: 20px;
  font-family: "Homemade Apple";
  transform: rotate(-15deg);
  white-space: pre;
  line-height: 1em;
  color: #393939;
}

.hint:hover {
  color: #888888;
}

body.dial main {
}

body.dial .safe {
  position: fixed;
}

body.handle main {
  overflow: hidden;
}

body.handle .safe {
  position: initial;
}

              
            
!

JS

              
                const combination = [53, 22, 79];
const pageHeight = window.innerHeight;
let pos = 0;
let pSafePost = 0;
let cracked = false;
let win = false;
let timer;

const root = document.documentElement;
const body = document.getElementsByTagName("body")[0];
const position = document.getElementsByClassName("position")[0];
const chalkboard = document.getElementsByClassName("chalkboard")[0];
const boxFlash = document.getElementsByClassName("box-flash")[0];

window.addEventListener("scroll", (e) => {
  root.style.setProperty("--scroll", window.scrollY);
  const safePos = Math.floor((window.scrollY / (10000 - pageHeight)) * 100);

  position.innerText = safePos;

  if (timer) clearTimeout(timer);

  timer = setTimeout(() => {
    if (safePos === pSafePost) return;
    boxFlash.classList.remove("click", "near", "off");
    if (safePos && combination[pos] === safePos) {
      void boxFlash.offsetWidth;
      boxFlash.classList.add("click");
      chalkboard.innerText = chalkboard.innerText + safePos + "\n";
      if (++pos === 3) cracked = true;
    } else if (safePos && Math.abs(combination[pos] - safePos) < 3) {
      void boxFlash.offsetWidth;
      boxFlash.classList.add("near");
    } else {
      void boxFlash.offsetWidth;
      boxFlash.classList.add("off");
    }
    pSafePost = safePos;
  }, 100);

  if (window.scrollY === 0 && !cracked) {
    body.classList.remove("handle");
    body.classList.add("dial");
    chalkboard.innerText = "";
    cracked = false;
    win = false;
    pos = 0;
  }

  if (cracked === true && !win) {
    body.classList.remove("dial");
    body.classList.add("handle");
    document.documentElement.scrollTop = 0;
    win = true;
  }
});

              
            
!
999px

Console