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About the <head>

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CSS

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HTML 

              
                <main>
  <div class="outer-glow"></div>
  <div class="circle-line"></div>
  <div class="inner">
    <span>
      <div class="particles-wrapper">
  <div class="particle particle-1"></div>
  <div class="particle particle-2"></div>
  <div class="particle particle-3"></div>
</div>
    </span>
    <input type="range" min=0 max=100 value=0>
    <output data-value="0">0</output>
    <div class="halo-inner"></div>
    <div class="halo-outer">
    </div>
  </di>
</main>

<div id="info-box" data-info-chrome="āœ… Rendering perfectly in Chrome" data-info-safari="āŒ Rendering broken in Safari" data-info-firefox="āŒ Rendering broken in Firefox" data-presentation-width="80vw" data-presentation-height="80vh" data-inspiration="https://dribbble.com/shots/7887362-Black-Magic-Mode"></div>
<svg>
  <defs>
    <filter id="turbulence" x="0" y="0" width="100%" height="100%">
    <feGaussianBlur in="SourceGraphic" stdDeviation="10"></feGaussianBlur>
    <feTurbulence id="liquid-filter" numOctaves="31" seed="50" baseFrequency="1.02 0.05"></feTurbulence>
    <feDisplacementMap xChannelSelector="G" yChannelSelector="B" scale="30" in="SourceGraphic"></feDisplacementMap>
    <feGaussianBlur stdDeviation="0.8"></feGaussianBlur>
    <animate xlink:href="#liquid-filter" attributeName="baseFrequency" dur="60s" keyTimes="0;0.5;1" values="0.01 0.06;0.04 0.09;0.02 0.04" repeatCount="indefinite"></animate>
  </filter>
  </defs>
</svg>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Sora:wght@200;400;500&display=swap");


@layer properties {
  @property --value {
    syntax: "<number>";
    inherits: true;
    initial-value: 0;
  }
}

:root {
  --bg-grain: url("data:image/svg+xml,%3Csvg viewBox='0 0 600 600' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  --bg-color: hsl(229deg 29% 10%);


  --glow-color-opacity: 0;
  --glow-color: oklch(82.6% 0.185 76.24 / calc(var(--glow-color-opacity) * 1%));
}

@supports (color: color(display-p3 0 0 0)) {
  :root {
    // --glow-color-p3: 0.04 1 0.62;
    // --glow-color-p3: 0.23 0.07 0.99;
    // --glow-color-p3: 0.7 0.09 0.2;

    --glow-color-opacity: 100;
    --glow-color-luminance: 10;
    --glow-color-p3: 0.99 0.71 0.18;
    --glow-color: color-mix(
      in lch,
      color(
        display-p3 var(--glow-color-p3) / calc(var(--glow-color-opacity) * 1%)
      ),
      white calc(var(--glow-color-luminance) * 1%)
    );
  }
}

*,
*:before,
*:after {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  background-image: radial-gradient(ellipse at 50% 0%, white, rgb(0 0 0 / 40%)),
    repeating-radial-gradient(
      circle at center,
      rgb(0 0 0 / 60%),
      rgb(0 0 0 / 60%) 14px,
      rgb(255 255 255 / 0%) 18px,
      rgb(255 255 255 / 30%) 18px,
      rgb(0 0 0 / 60%) 21px
    );
  font-family: "Sora", sans-serif;
  background-blend-mode: soft-light;
  background-size: 100% 100%;

  display: grid;
  place-items: center;
  
  &:before {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, transparent 50%, hsl(233.56 57% 6% / 60%));
  }

  &:after {
    position: absolute;
    display: block;
    content: "";
    width: 100%;
    height: 100%;
    background: var(--bg-grain) repeat top left / 300px;
    z-index: 10;
    opacity: 0.15;
    mix-blend-mode: color-dodge;
    pointer-events: none;
  }
}


main {
  width: 500px;
  max-width: 100%;
  aspect-ratio: 1/1;
  border-radius: 10e5px;
  background: radial-gradient(
    ellipse at 50% 0%,
    hsl(274deg 14% 12%),
    hsl(274deg 16% 4%)
  );
  position: relative;
  display: block;
  align-items: center;
  justify-content: center;
  
  // Small trick to smoothen everything
  // Note that you should barely use will-change ( https://developer.mozilla.org/en-US/docs/Web/CSS/will-change )
  // I use it because this demo is visually heavy, and it now GPU accelerated
  // You can now zoom in and inspect this pen without too much visual glitch
  *,*:before,*:after {
    will-change: transform, filter, background;
  }

  &:after {
    content: "";
    position: absolute;
    width: 80%;
    height: 80%;
    background: hsl(240deg 24% 10%);
    display: block;
    border-radius: inherit;
    box-shadow: inset 0 0 26px rgb(0 0 0 / 80%),
      inset 0 -4px 6px -1px rgba(255 255 255 / 10%);
    z-index: inherit;
    margin: auto;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
  }

  &:before {
    content: "";
    display: block;
    position: absolute;
    width: 60%;
    aspect-ratio: 1/1;
    box-shadow: inset 0 1px 1px rgb(255 255 255 / 0.3),
      inset 0 -1px 2px rgb(0 0 0 / 0.3), 0 0 20px 2px rgb(0 0 0 / 20%);
    z-index: 11;
    border-radius: 1e5px;
    pointer-events: none;
    margin: auto;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
  }

  & .circle-line {
    --glow-color-opacity: calc(var(--value) / 2);
    --glow-color-luminance: 70;
    --glow-color: color-mix(
      in lch,
      color(display-p3 0.99 0.71 0.18 / calc(var(--glow-color-opacity) * 1%)),
      white calc(var(--glow-color-luminance) * 1%)
    );
    position: absolute;
    width: 80.5%;
    height: 80.5%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    background: conic-gradient(
      from 0.5turn,
      transparent calc(100% - var(--value) * 1%),
      var(--glow-color) calc(100% - calc(var(--value) * 1%))
    );
     mask-image: conic-gradient(
        from 0.5turn,
        black,
        black,
        transparent
      );
    border-radius: 1e5px;
    transform: rotateY(180deg);
  }

  & .outer-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    transform: rotate(calc(var(--value) * 3.6 * 1deg));

    &:after {
      content: "";
      display: block;
      position: absolute;
      width: 20px;
      height: 50px;
      background: var(--glow-color);
      border-radius: 100%;
      z-index: 0;
      transform: translate(240px, 500px);
      filter: blur(20px);
      mix-blend-mode: plus-lighter;
      opacity: calc(var(--value) / 100);
    }
  }
  & > div.inner {
    width: 300px;
    aspect-ratio: 1/1;
    position: absolute;
    margin: auto;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;

    & .halo-outer {
      position: absolute;
      width: 100%;
      height: 100%;
      box-shadow: inset 0 0 16px rgb(0 0 0 / 100%),
        inset 0 0 8px rgb(0 0 0 / 80%), inset 0 0 6px rgb(0 0 0 / 60%);

      border-radius: 1e5px;
      transform: scale(1.66) rotateY(180deg);

      z-index: 5;

      &:before {
        --glow-color-opacity: calc(var(--value) / 2);
        --glow-color-luminance: 10;
        --glow-color: color-mix(
          in lch,
          color(
            display-p3 var(--glow-color-p3) / calc(var(--glow-color-opacity) * 1%)
          ),
          white calc(var(--glow-color-luminance) * 1%)
        );
        content: "";
        display: block;
        position: absolute;
        width: 100%;
        height: 100%;
        transform: scale(0.6) rotate(calc(calc(var(--value) * 3.6 * -1deg)));
        border-radius: 1e5px;
        background-color: var(--bg-color);
        background-image: radial-gradient(
            ellipse at 50% calc(210% + calc(var(--value)/2 * -1%)),
            var(--glow-color) 30%,
            transparent 40%
          ),
          linear-gradient(
            to bottom right,
            rgb(255 255 255 / 01%) 45%,
            rgb(0 0 0 / 0%) 50%
          );
        z-index: 2;
        backdrop-filter: saturate(1.5);
      }
      &:after {
        content: "";
        display: block;
        position: absolute;
        border-radius: 10e5px;
        width: 100%;
        height: 100%;
        background-image: linear-gradient(
          to bottom,
          rgb(255 255 255 / 80%),
          rgb(0 0 0 / 10%)
        );
        transform: scale(0.6) ;
        z-index: 6;
        mix-blend-mode: soft-light;
      }

      & canvas {
        position: absolute;
        width: 100% !important;
        height: 100% !important;
        border-radius: 10e5px;
        opacity: 0.05;
        pointer-events: none;
        z-index: -1;
      }
    }

    & .halo-inner {
      --glow-color-opacity: var(--value);
      --glow-color: color-mix(
        in lch,
        color(
          display-p3 var(--glow-color-p3) / calc(var(--glow-color-opacity) * 1%)
        ),
        white 20%
      );
      background: conic-gradient(
        from 0.5turn,
        transparent calc(100% - var(--value) * 1%),
        var(--glow-color) calc(100% - var(--value) * 1%)
      );
      /* With all these transforms, I couldn't figure out a better
       * way to fade out the start of the gradient.   
      */
      mask-image: conic-gradient(
        from 0.5turn,
        black,
        black,
        transparent
      );
      position: absolute;
      width: 100%;
      height: 100%;
      border-radius: 1e5px;
      opacity: 0.7;
      transform: scale(1.66) rotateY(180deg);
      mix-blend-mode: plus-lighter;
      z-index: -1;
      filter: saturate(2);
      overflow: hidden;

      &:after {
        --current-opacity: opacity(calc(var(--value)*0.01));
        content: "";
        display: block;
        position: absolute;
        width: 100%;
        height: 100%;
        
        background: url(https://assets.codepen.io/64/toppng.com-water-texture-water-1500x1500.png);
        background-size: 80px;
        
        mask-image: conic-gradient(from 0.5turn, transparent calc(100% - var(--value) * 1%), white calc(100% - var(--value) * 1%));
        filter: 
          brightness(3400%) url(#turbulence) var(--current-opacity);
        mix-blend-mode: overlay
      }
    }

    & span {
      display: block;
      position: absolute;
      z-index: 1;
      width: 100%;
      height: 100%;

      position: relative;
      border-radius: 10e5px;
      box-shadow: 0 0 26px rgb(0 0 0 / 80%);
      transform: rotate(calc(var(--value) * 3.6 * 1deg));
      transform-origin: center center;

      &:after {
        content: "";
        display: block;
        position: absolute;
        width: 3px;
        height: 99px;
        background: #fff;
        top: 100%;
        left: 50%;
        border-radius: 0 0 2px 2px;
        z-index: -1;
        box-shadow: 0 0 calc(20px + calc(var(--value) / 10 * 1px))
          calc(5px + calc(var(--value) / 6 * 1px)) var(--glow-color), inset 0 0 1px var(--glow-color), 0 0 2px 1px black;
        transform: translateX(-50%);
        transform-origin: center top;
        animation: reveal 1s ease forwards;
        filter: saturate(200%) ;
        @keyframes reveal {
          from {
        transform: translateX(-50%) scaleY(0);
            
          }
          to {
            
        transform: translateX(-50%) scaleY(1);
          }
        }
      }

      &:before {
        content: "";
        display: block;
        position: absolute;
        width: 3px;
        height: 13%;
        background: #fff;
        top: 105%;
        left: 50%;
        z-index: -1;
        opacity: calc(var(--value) / 5);
        box-shadow: 0 0 calc(20px + calc(var(--value) / 10 * 1px))
          calc(5px + calc(var(--value) / 6 * 1px)) var(--glow-color);
        transform: translateX(calc(-50% + 15px));
        filter: blur(5px) saturate(200%) url(#turbulence) ;
        transform-origin: center left;
      }
    }

    & input {
      //display: none;
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      opacity: 0;
      cursor: grab;
      z-index: 10;

      &:active {
        cursor: grabbing;
      }
    }

    & output {
      color: var(--glow-color);
      position: relative;
      font-variant-numeric: slashed-zero tabular-nums;
      font-feature-settings: "tnum";
      font-size: 5em;
      font-weight: 500;
      position: absolute;
      user-select: none;
      pointer-events: none;
      position: absolute;
      z-index: 10;
      text-shadow: 0 0 2px black;

      &:after {
        --glow-color-luminance: 80;
        --glow-color: color-mix(
          in lch,
          color(
            display-p3 0.99 0.71 0.18 / calc(var(--glow-color-opacity) * 1%)
          ),
          white calc(var(--glow-color-luminance) * 1%)
        );
        content: attr(data-value);
        position: absolute;
        top: 0;
        left: 0;
        color: var(--glow-color);
        opacity: 1;
        filter: blur(calc(var(--value)/10*1px)) saturate(5);

        user-select: none;
        pointer-events: none;
        mix-blend-mode: plus-lighter;
      }
    }
  }
}
/* Config */
$spacing: 100px;
$time-1: calc(20s / calc(var(--value)/10));
$color: var(--glow-color);
/* Pauls awesome mixin */
@function particles($max) {
   $val: 0px 0px $color;
   @for $i from 1 through $max {
      $val: #{$val},
      random($spacing*1.5)+px random($spacing*1.5)+px $color;
   }
   @return $val;
}

@mixin particles($max) {
   box-shadow: particles($max);
}


.particles-wrapper {
  position: absolute;
  width: 110px;
  height: 110px;
  left: 45%;
  top: 97%;
  overflow: hidden;
  transform: rotate(90deg);
  trasnform-origin: center center;
  mask-image:  radial-gradient(circle, #000, transparent 70%);
  opacity: calc(var(--value)/10);
  filter: brightness(500%);
}

.particle,
.particle:after {
  background: transparent;
}

.particle:after {
  position: absolute;
  content: "";
  top: $spacing;
}
[class*="particle-"] {
  border-radius: 10px;
  filter: blur(0.5px) saturate(200%) contrast(200%);
}
.particle-1 {
  animation: animParticle $time-1 linear infinite;
  @include particles(100);
  height: 1px;
  width: 1px;
}

.particle-1:after {
  @include particles(100);
  height: 1px;
  width: 1px;
}

.particle-2 {
  animation: animParticle $time-1 linear infinite;
  @include particles(100);
  height: 2px;
  width: 2px;
}

.particle-2:after {
  @include particles(100);
  height: 2px;
  width: 2px;
}

.particle-4 {
  animation: animParticle $time-1 linear infinite;
  @include particles(100);
  height: 1px;
  width: 1px;
}

.particle-4:after {
  @include particles(100);
  height: 1px;
  width: 1px;
}

@keyframes animParticle {
  from { transform: translateY(0px); }
  to   { transform: translateY($spacing*2 * -1); }
}

svg {
  position: absolute;
}
!

JS 

              
                
const main = document.querySelector('main');
const rangeInput = document.querySelector('input[type="range"]');
const outputValue = document.querySelector('output[data-value]');

const getRangeValue = () => {
  const value = rangeInput.value;
  outputValue.textContent = value;
  outputValue.dataset.value = value;
  document.body.style.setProperty('--value', value)
}
window.addEventListener('DOMContentLoaded', getRangeValue)
rangeInput.addEventListener('input', getRangeValue);
!
999px

Console