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CSS

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HTML 

              
                <div class="range-container">
  <p class="mono">Settings</p>
  <div class="range-control">
    <label>Character solve time</label>
    <p>The amount of time in milliseconds that each character animates for.</p>
    <input type="range" id="solve" min="1" max="1600">
    <div class="range-value-container">
      <span id="solve-time-value" class="range-value mono">23</span>
    </div>
  </div>

  <div class="range-control">
    <label>Character selection time</label>
    <p>The amount of time in milliseconds that determines how often a random character is displayed.</p>
    <input type="range" id="spin" min="1" max="80">
    <div class="range-value-container">
      <span id="selection-time-value" class="range-value mono">23</span>
    </div>
  </div>

  <div class="range-control">
    <label>Next character delay</label>
    <p>The amount of time in milliseconds to wait before animating the next charcter in the string.</p>
    <input type="range" id="delay" min="1" max="500">
    <div class="range-value-container">
      <span id="delay-time-value" class="range-value mono">23</span>
    </div>
  </div>

  <div class="range-control">
    <label>Characters</label>
    <input type="text" id="characters" maxlength="18">
  </div>

  <div class="result">
    <p class="mono">Result</p>
    <a id="result-characters" href="#" class="cipher">Hover Me!</a>
  </div>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Space+Mono&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@500;600&display=swap");

body {
  align-items: center;
  background-color: #13223b;
  display: flex;
  flex-direction: column;
  font-family: "Poppins", sans-serif;
  height: 100vh;
  justify-content: center;

  a {
    color: #ffdd40;
    display: block;
    font-family: "Space Mono", monospace;
    font-size: 26px;
    letter-spacing: 5px;
    margin: 0 10px 6px 10px;
    padding: 2px 12px 6px 19px;
    position: relative;
    text-decoration: none;
    text-shadow: #a68800 1px 0 10px;
  }

  .range-container {
    background-color: #1d345a;
    border: 1px solid #055eb4;
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: auto;
    width: 450px;

    label {
      color: #6db7ff;
      display: block;
      font-size: 18px;
      font-weight: 600;
    }

    p {
      color: white;
      font-size: 14px;
      margin-top: 8px;
    }

    .mono {
      font-family: "Space Mono", monospace;
      font-size: 20px;
      margin: 12px 0 0 0;
      text-align: center;
    }

    .range-control {
      padding: 5px 20px;
      position: relative;

      .range-value {
        align-items: center;
        background-color: #022547;
        border: 1px solid #055eb4;
        border-radius: 4px;
        bottom: -28px;
        color: #ffdd40;
        display: flex;
        font-size: 14px;
        height: 25px;
        justify-content: center;
        padding: 0 9px;
        position: absolute;
        right: 18px;
        width: 30px;
      }
    }

    .result {
      align-items: center;
      background-color: #13223b;
      border-top: 1px solid #055eb4;
      display: flex;
      flex-direction: column;
      margin-top: 10px;
    }
  }

  input[type="text"] {
    appearance: none;
    background-color: #022547;
    border: 1px solid #055eb4;
    border-radius: 4px;
    box-sizing: border-box;
    color: #ffdd40;
    font-family: "Space Mono", monospace;
    font-size: 17px;
    margin-top: 8px;
    outline: none;
    padding: 8px 12px;
    transition: opacity 300ms ease-in-out;
    -webkit-appearance: none;
    width: 100%;

    &:focus {
      border-color: #6db7ff;
    }

    &:disabled {
      opacity: 50%;
    }
  }

  input[type="range"] {
    appearance: none;
    background: transparent;
    cursor: pointer;
    transition: opacity 300ms ease-in-out;
    -webkit-appearance: none;
    width: 100%;

    &:focus {
      outline: none;
    }

    &:disabled {
      opacity: 50%;
    }

    /* Chrome, Safari, Opera and Edge Chromium */
    &::-webkit-slider-runnable-track {
      background-color: #022547;
      border: 1px solid #055eb4;
      border-radius: 4px;
      height: 6px;
    }

    &::-webkit-slider-thumb {
      appearance: none;
      background-color: #6db7ff;
      border: 1px solid #055eb4;
      border-radius: 50px;
      height: 20px;
      margin-top: -12px;
      -webkit-appearance: none;
      width: 20px;
    }

    &:focus::-webkit-slider-thumb {
      border: 1px solid #055eb4;
      outline: 2px solid #ffdd40;
      outline-offset: 3px;
    }

    /* Firefox */
    &::-moz-range-track {
      background-color: #022547;
      border: 1px solid #055eb4;
      border-radius: 4px;
      height: 6px;
    }

    &::-moz-range-thumb {
      background-color: #6db7ff;
      border: 1px solid #055eb4;
      border-radius: 50px;
      height: 20px;
      width: 20px;
    }

    &:focus::-moz-range-thumb {
      background-color: #ffdd40;
      border: 1px solid transparent;
      outline: 2px solid #ffdd40;
      outline-offset: 3px;
    }
  }
}
!

JS 

              
                const characters = [..."ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890*#@/*!%&^"];
const resultCharacters = document.querySelector("#result-characters");

const solveSlider = document.querySelector("#solve");
const selectionSlider = document.querySelector("#spin");
const delaySlider = document.querySelector("#delay");
const characterInput = document.querySelector("#characters");

const solveTimeContainer = document.querySelector("#solve-time-value");
const selectionTimeContainer = document.querySelector("#selection-time-value");
const delayTimeContainer = document.querySelector("#delay-time-value");

let solveMilliseconds = 800;
let characterSelectionMilliseconds = 40;
let delayMilliseconds = 250;

solveSlider.value = solveMilliseconds;
selectionSlider.value = characterSelectionMilliseconds;
delaySlider.value = delayMilliseconds;

solveTimeContainer.innerText = solveMilliseconds;
selectionTimeContainer.innerText = characterSelectionMilliseconds;
delayTimeContainer.innerText = delayMilliseconds;

characterInput.value = "Hover Me!";

const randomArrayElement = (arr) => {
  return arr[(arr.length * Math.random()) | 0];
};

solveSlider.addEventListener("input", (e) => {
  solveMilliseconds = parseInt(e.target.value, 10);
  solveTimeContainer.innerText = e.target.value;
});

selectionSlider.addEventListener("input", (e) => {
  characterSelectionMilliseconds = parseInt(e.target.value, 10);
  selectionTimeContainer.innerText = e.target.value;
});

delaySlider.addEventListener("input", (e) => {
  delayMilliseconds = parseInt(e.target.value, 10);
  delayTimeContainer.innerText = e.target.value;
});

resultCharacters.addEventListener("mouseenter", (e) => {
  const element = e.target;
  scrambleText(element);
  e.preventDefault();
});

characterInput.addEventListener("input", (e) => {
  resultCharacters.innerText = characterInput.value;
});

function scrambleText(element) {
  if (element.classList.contains("active") === false) {
    let delay = 0;
    const elementText = element.innerText;
    const elementCharacters = [...elementText];
    const lockMilliseconds =
      delayMilliseconds * elementCharacters.length + solveMilliseconds;

    element.classList.add("active");
    deactivateInputs();

    setTimeout(() => {
      element.classList.remove("active");
      activateInputs();
    }, lockMilliseconds);

    elementCharacters.forEach((character, index) => {
      setTimeout(
        () => {
          let intervalId = setInterval(() => {
            const randomCharacter = randomArrayElement(characters);
            element.innerText = replaceCharacter(
              element.innerText,
              index,
              randomCharacter
            );

            setTimeout(() => {
              clearInterval(intervalId);
              element.innerText = replaceCharacter(
                element.innerText,
                index,
                elementCharacters[index]
              );
            }, solveMilliseconds);
          }, characterSelectionMilliseconds);
        },
        delay === 0 ? (delay += 1) : (delay += delayMilliseconds)
      );
    });
  }
}

function deactivateInputs() {
  characterInput.disabled = true;
  solveSlider.disabled = true;
  selectionSlider.disabled = true;
  delaySlider.disabled = true;
}

function activateInputs() {
  characterInput.disabled = false;
  solveSlider.disabled = false;
  selectionSlider.disabled = false;
  delaySlider.disabled = false;
}

function replaceCharacter(str, index, chr) {
  return `${str.substring(0, index)}${chr}${str.substring(index + 1)}`;
}
!
999px

Console