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HTML 

              
                <div class="scene">
  <div class="backdrop"></div>
  <div class="noise"></div>
  <div class="dots"></div>
  <div class="canvas"></div>
</div>
!

CSS 

              
                @font-face {
  font-family: "Geist";
  src: url("https://assets.codepen.io/605876/GeistVF.ttf") format("truetype");
}

*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --spread: 20;
  --dot: 2;
  --width: 300;
  --height: 300;
  --size: 256;
  --speed: 20;
  --brightness: 1.25;
  --intersect: source-in, xor;
  --intersect-moz: intersect;
  --depth: 100px;
  --bg: conic-gradient(from 180deg at 50% 70%,hsla(0,0%,98%,1) 0deg,#eec32d 72.0000010728836deg,#ec4b4b 144.0000021457672deg,#709ab9 216.00000858306885deg,#4dffbf 288.0000042915344deg,hsla(0,0%,98%,1) 1turn);
/*   --bg: purple; */
}

body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  background: hsl(0 0% 10%);
}

.scene {
	background: #000;
	border-radius: 12px;
  transform-style: preserve-3d;
}

.canvas {
	min-width: 200px;
	min-height: 200px;
  width: calc(var(--width) * 1px);
  height: calc(var(--height) * 1px);
}

.canvas::before {
	content: "";
	position: absolute;
	inset: 0;
  background: var(--bg);
  mask:
    radial-gradient(circle at 50% 50%, white calc(var(--dot) * 1px), transparent calc((var(--dot) * 1px) + 0.5px)) 50% 50% / calc(var(--spread) * 1px) calc(var(--spread) * 1px),
    url("https://assets.codepen.io/605876/noise-mask.png") calc(var(--size) * 1px) 50% / calc(var(--size) * 1px) calc(var(--size) * 1px);
  -webkit-mask-composite: var(--intersect);
  mask-composite: var(--intersect-moz);
  animation: flicker calc(var(--speed) * 1s) infinite linear;
  filter: brightness(var(--brightness));
  border-radius: 12px;
}

@keyframes flicker {
  to {
    mask-position: 50% 50%, 0 50%;
  }
}

.no-mask .canvas {
	mask: unset;
}
.dots-mask .canvas {
	mask: radial-gradient(circle at 50% 50%, white calc(var(--dot) * 1px), transparent calc((var(--dot) * 1px) + 0.5px)) 50% 50% / calc(var(--spread) * 1px) calc(var(--spread) * 1px);
}
.noise-mask .canvas {
	mask: url("https://assets.codepen.io/605876/noise-mask.png") calc(var(--size) * 1px) 50% / calc(var(--size) * 1px) calc(var(--size) * 1px);
}

.backdrop {
	background: var(--bg);
	position: absolute;
	inset: 0;
}

.noise::before {
	content: "";
	background: var(--bg);
	position: absolute;
	inset: 0;
	mask: url("https://assets.codepen.io/605876/noise-mask.png") calc(var(--size) * 1px) 50% / calc(var(--size) * 1px) calc(var(--size) * 1px);
	animation: flicker calc(var(--speed) * 1s) infinite linear;
}

.dots, .noise, .backdrop {
	position: absolute;
	inset: 0;
	opacity: 0;
}

.dots::before {
	content: "";
	background: var(--bg);
	position: absolute;
	inset: 0;
	mask: radial-gradient(circle at 50% 50%, white calc(var(--dot) * 1px), transparent calc((var(--dot) * 1px) + 0.5px)) 50% 50% / calc(var(--spread) * 1px) calc(var(--spread) * 1px);
}

.dots::after,
.noise::after,
.backdrop::after,
.scene::after,
.canvas::after {
	content: "Dots Mask";
	white-space: nowrap;
	position: absolute;
	left: calc(100% + 3rem);
	top: 50%;
	translate: 0 -50%;
	font-size: 2rem;
	color: hsl(0 0% 60%);
	font-family: "Geist", sans-serif;
	font-weight: 60;
	background: linear-gradient(white, hsl(0 0% 0%));
	background-clip: text;
	-webkit-background-clip: text;
	opacity: 0;
}

.noise::after {
	content: "Noise Mask";
}

.backdrop::after {
	content: "Background";
}

.scene::after {
	content: "Backdrop";
}
.canvas::after {
	content: "Composite Mask";
}

[data-exploded] :is(.dots, .noise, .backdrop),
[data-exploded] .dots::after,
[data-exploded] .noise::after,
[data-exploded] .backdrop::after {
	opacity: 1;
}


[data-exploded] .scene {
	transform: rotateX(-24deg) rotateY(32deg) rotateX(90deg) translate3d(0, 0, calc(var(--depth) * -2));
  background: hsl(0 0% 10%);
	transition: transform 1s 0s, background 1s 0s;
}

[data-exploded] .canvas {
	transform: translate3d(0, 0, calc(var(--depth) * 4));
	transition: transform 1s 1.5s;
}

[data-exploded] .scene::after,
[data-exploded] .canvas::after {
	opacity: 1;
	transition: opacity 0.5s 2s;
}

.dots {
	transform: translate3d(0, 0, calc(var(--depth) * 3));
}

[data-exploded] .dots,
[data-exploded] .dots::after {
	transition: opacity 0.5s 3s;
}

.noise {
	transform: translate3d(0, 0, calc(var(--depth) * 2));
}

[data-exploded] .noise,
[data-exploded] .noise::after {
	transition: opacity 0.5s 2.75s;
}

.backdrop {
	transform: translate3d(0, 0, var(--depth));
}

[data-exploded] .backdrop,
[data-exploded] .backdrop::after {
	transition: opacity 0.5s 2.5s;
}


.scene {
	transition: transform 1s 2.5s, background 1s 2.5s;
}

.canvas {
	transition: transform 1s 1.5s;
}

.scene::after,
.canvas::after {
	transition: opacity 0.5s 1s;
}

.backdrop,
.backdrop::after {
	transition: opacity 0.5s 0.5s;
}

.noise,
.noise::after {
	transition: opacity 0.5s 0.25s;
}

.dots,
.dots::after {
	transition: opacity 0.5s 0s;
}

[data-exploded] body {
  background: hsl(0 0% 0%);
  transition: background 1s 0s;
}

body {
  transition: background 1s 2.5s;
}
!

JS 

              
                import { GUI } from 'https://cdn.skypack.dev/dat.gui'

const CONFIG = {
  explode: false,
  spread: 20,
  dot: 2,
  width: 300,
  height: 300,
  size: 512,
  speed: 20,
  brightness: 1.4,
  dots: true,
  noise: true,
  intersect: true,
}
const UPDATE = () => {
  for (const key of Object.keys(CONFIG)) {
    if (key !== 'intersect' && key !== 'dots' && key !== 'noise')
      document.documentElement.style.setProperty(`--${key}`, CONFIG[key])
    if (key === 'intersect') {
      document.documentElement.style.setProperty(
        '--intersect',
        CONFIG.intersect ? 'source-in, xor' : 'unset'
      )
      document.documentElement.style.setProperty(
        '--intersect-moz',
        CONFIG.intersect ? 'intersect' : 'unset'
      )
    }
    // Work out the mask combo
    document.documentElement.className = ''
    if (!CONFIG.dots && CONFIG.noise) document.documentElement.className = 'noise-mask'
    if (CONFIG.dots && !CONFIG.noise) document.documentElement.className = 'dots-mask'
    if (!CONFIG.dots && !CONFIG.noise) document.documentElement.className = 'no-mask'
  }
}

const EXPLODE = () => {
  document.documentElement.toggleAttribute('data-exploded')
}

const CTRL = new GUI({
  width: 320,
})
CTRL.add(CONFIG, 'explode').name('Explode?').onChange(EXPLODE)
CTRL.add(CONFIG, 'spread', 1, 100, 1).name('Spread (px)').onChange(UPDATE)
CTRL.add(CONFIG, 'dot', 1, 100, 1).name('Dot Size (px)').onChange(UPDATE)
CTRL.add(CONFIG, 'width', 100, 600, 1)
  .name('Canvas Width (px)')
  .onChange(UPDATE)
CTRL.add(CONFIG, 'height', 100, 600, 1)
  .name('Canvas Height (px)')
  .onChange(UPDATE)
CTRL.add(CONFIG, 'size', 1, 1920, 1).name('Mask Size (px)').onChange(UPDATE)
CTRL.add(CONFIG, 'brightness', 0.5, 5, 0.1).name('Brightness').onChange(UPDATE)
CTRL.add(CONFIG, 'speed', 2, 60, 1).name('Speed (s)').onChange(UPDATE)
CTRL.add(CONFIG, 'intersect').name('Mask Composite').onChange(UPDATE)
CTRL.add(CONFIG, 'dots').name('Dot Mask').onChange(UPDATE)
CTRL.add(CONFIG, 'noise').name('Perlin Mask').onChange(UPDATE)

UPDATE()
!
999px

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