CodePen Embed - Vanta.JSランダム背景

<body id="body">
  <div id="info-box"></div>
  <h1 id="heading">Vanta.JS　ランダム背景</h1>
  <button id="randomize-button"><span>ランダム</span></button>
  <a href="https://prodouga.com" target="_blank" id="portfolio-link">prodouga</a>
</body>

html,
body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  margin: 0;
  padding: 0;
  font-family: 'Source Code Pro', monospace;
}

/* Styling for Info Box*/
#info-box {
  position: fixed;
  top: 10px;
  left: 10px;
  padding: 10px;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 5px;
  font-weight: 400;
}

/* Styling for Randomize Button */
#randomize-button {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 0.1em 0.25em;
  width: 13em;
  height: 4.2em;
  background-color: #212121;
  border: 0.08em solid #fff;
  border-radius: 0.3em;
  font-size: 12px;
  font-family: 'Source Code Pro', monospace;
  cursor: pointer;
}

#randomize-button span {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  bottom: 0.4em;
  width: 8.25em;
  height: 2.5em;
  background-color: #212121;
  border-radius: 0.2em;
  font-size: 1.5em;
  color: #fff;
  border: 0.08em solid #fff;
  box-shadow: 0 0.4em 0.1em 0.019em #fff;
}

#randomize-button span:hover {
  transition: all 0.5s;
  transform: translate(0, 0.4em);
  box-shadow: 0 0 0 0 #fff;
}

#randomize-button span:not(hover) {
  transition: all 1s;
}

/* Styling for Heading */
#heading {
  position: fixed;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -100%);
  text-align: center;
  font-size: 32px;
  font-weight: 600;
  padding-bottom: 2%;
}

/* Styling for Portfolio Link */
#portfolio-link {
    position: fixed;
    top: 3%;
    right: 2%;
    z-index: 10;
    font-size: 20px;
    color: #000;
  font-family: 'Source Code Pro', monospace;
    text-decoration: none;
}
  
#portfolio-link:hover {
    color: #FF8C42;
}

// Executes Code After HTML is loaded.
document.addEventListener("DOMContentLoaded", () => {

// defines a function that generates a random number within a specified range.
const randomInRange = (min, max) => Math.random() * (max - min) + min;

// defines a function that generates a random HSL within a specified range and returns it as a hexColor.
const randomHslColor = (hueRange, saturationRange, lightnessRange) => {
    const hue = randomInRange(hueRange[0], hueRange[1]);
    const saturation = randomInRange(saturationRange[0], saturationRange[1]);
    const lightness = randomInRange(lightnessRange[0], lightnessRange[1]);

    const hslColor = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
    const hexColor = parseInt(tinycolor(hslColor).toHex(), 16);
    return hexColor;
};

// Displays the randomized values in the #info-box element.
const displayInfo = () => {
    const infoBox = document.getElementById("info-box");
    infoBox.innerHTML = `
    Highlight Color: 0x${effect.options.highlightColor.toString(16).toUpperCase()}<br>
    Midtone Color: 0x${effect.options.midtoneColor.toString(16).toUpperCase()}<br>
    Lowlight Color: 0x${effect.options.lowlightColor.toString(16).toUpperCase()}<br>
    Base Color: 0x${effect.options.baseColor.toString(16).toUpperCase()}<br>
    Blur Factor: ${effect.options.blurFactor.toFixed(2)}<br>
    Zoom: ${effect.options.zoom.toFixed(2)}<br>
    Speed: ${effect.options.speed.toFixed(2)}
  `;
};

// Destroys the previous effect when a new one is generated.
let effect;

const createEffect = () => {
    if (effect) {
        effect.destroy();
    }

// Main Vanta.JS script
effect = VANTA.FOG({
    el: "#body",
    highlightColor: randomHslColor([0, 360], [70, 100], [70, 100]),
    midtoneColor: randomHslColor([0, 360], [60, 100], [50, 70]),
    lowlightColor: randomHslColor([0, 360], [50, 100], [40, 60]),
    baseColor: randomHslColor([0, 360], [40, 100], [30, 50]),
    blurFactor: randomInRange(0.6, 0.9),
    zoom: randomInRange(0.3, 1.3),
    speed: randomInRange(1, 3),
});

// Calls function to update info with new values.
displayInfo();
};

// Creates listener for randomize-button that registers click and executes the randomize function.
document.getElementById("randomize-button").addEventListener("click", createEffect);
createEffect();

// Creates listener for export-button that registers click and executes the randomize function.
document.getElementById("export-button").addEventListener("click", exportConfig);

});

This Pen is owned by Yushi Yamamoto on CodePen.

See more by @yamamotoyushi on CodePen

External CSS

https://fonts.googleapis.com/css2?family=Source+Code+Pro:wght@400;600&display=swap

External CSS

External JavaScript