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CSS

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HTML 

              
                <svg style="position: fixed;" xmlns='http://www.w3.org/2000/svg'>
	<filter id="led-screen">
		<feFlood id="filterPxl" x="7" y="7" width="2" height="2" result="flood"></feFlood>
		<feComposite id="filterCs" in="flood" in2="flood" operator="over" x="0" y="0" width="16" height="16" result="composite"></feComposite>
		<feTile x="0" y="0" width="10000" height="10000" in="composite" result="tile"></feTile>
		<feComposite in="SourceGraphic" in2="tile" operator="in"></feComposite>
		<feMorphology id="filterMorph" operator="dilate" radius="7" in="composite2" result="morphology"></feMorphology>
		<feImage id="filterCsImg" xlink:href="data:image/svg+xml,%3Csvg viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cellipse ry='25' rx='25' id='svg_1' cy='50' cx='50' /%3E%3C/svg%3E" x="0" y="0" width="16" height="16" preserveAspectRatio="xMidYMid meet" crossorigin="anonymous" result="image"></feImage>
		<feTile x="0" y="0" width="10000" height="10000" in="image" result="tile1"></feTile>
		<feComposite in="morphology" in2="tile1" operator="in" result="composite3"></feComposite>

		<feGaussianBlur stdDeviation="25" in="composite3" result="blur3" />

		<feBlend mode="screen" in="blur3" in2="composite3" result="blend" />

		<feComposite in="blend" in2="composite3" operator="over" result="composite5"></feComposite>

		<!-- 	Canva	 -->
		<feFlood flood-color="#000" id="canva" result="flood1"></feFlood>
		<feMerge result="merge">
			<feMergeNode in="flood1"></feMergeNode>
			<feMergeNode in="composite6"></feMergeNode>
			<feMergeNode in="composite5"></feMergeNode>
		</feMerge>

	</filter>
	<filter id="8bit-color" color-interpolation-filters="sRGB">
		<feComponentTransfer>
			<feFuncR type="discrete" tableValues="0 0.125 0.251 0.376 0.502 0.627 0.753 0.878" />
			<feFuncG type="discrete" tableValues="0 0.125 0.251 0.376 0.502 0.627 0.753 0.878" />
			<feFuncB type="discrete" tableValues="0 0.251 0.502 0.753" />
			<feFuncA type="identity" />
		</feComponentTransfer>
	</filter>
</svg>
<div id="movableDiv" class="filter"></div>

<div class="shadow">

</div>

<div class="marquee">
	<div class="track">
		<h1>LED Screen</h1>
	</div>
</div>

<p>Not in Firefox</p>

<div class="tool-bar">

	<details>
		<summary>🔧</summary>

		<label for="sizeInput">Dots Size</label>
		<input type="range" min="4" max="40" value="16" id="sizeInput">

		<label for="canvaSizeInput">Screen Size</label>
		<input type="range" min="80" max="512" value="320" id="canvaSizeInput">

	</details>
</div>

<div class="more-pens">
	<a target="_blank" href="https://codepen.io/rodzyk/pen/vYbPvaZ" title="SVG Filter — LED Screen">
		<img src="https://codepen.io/rodzyk/pen/vYbPvaZ/image/small.png" alt="SVG Filter — Pixelate">
	</a>
	<a target="_blank" href="https://codepen.io/rodzyk/pen/ZEPGyYx" title="SVG Filter — Pixelate">
		<img src="https://codepen.io/rodzyk/pen/ZEPGyYx/image/small.png" alt="SVG Filter — Cross-stitch">
	</a>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Orbitron:wght@900&display=swap");

.filter {
	position: fixed;
	width: min(90vw, 90vh);
	aspect-ratio: 10/7;
	user-select: none !important;
	pointer-events: none;
	touch-action: none;
	// border-radius: 50%;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	backdrop-filter: url(#led-screen);
	box-shadow: var(--shadow-elevation-high);

	// border: 4px solid;

	z-index: 1;

	color: #aaa;
	&::before,
	&::after {
		// content: "";
		position: absolute;
		border: 4px solid;
		width: 20%;
		height: 1rem;
		top: calc(-3rem + 5px);
		left: 50%;
		transform: translate(-50%);
	}

	&::before {
		width: 10%;
		top: calc(-2rem + 9px);
		border-bottom: 0;
	}

	&::after {
		background-color: currentColor;
		border-radius: 4px;
	}
}

h1 {
	margin: 0;
	--fsize: clamp(2rem, 16vw, 16rem);
	font-size: var(--fsize);
	text-transform: uppercase;
	text-align: center;
	color: white;
	// animation: waviy 4s infinite;
	font-family: "Orbitron", sans-serif;
	margin: 0;
}

.marquee {
	--fsize: clamp(2rem, 16vw, 16rem);
	font-size: var(--fsize);
	position: relative;
	width: 100vw;
	max-width: 100%;
	height: 1lh;
	overflow-x: hidden;
}

.track {
	position: absolute;
	white-space: nowrap;
	// will-change: transform;
	animation: marquee 8s linear infinite;
}

@keyframes marquee {
	from {
		transform: translateX(100%);
	}
	to {
		transform: translateX(-100%);
	}
}

html {
	--surface: hsl(200 10% 10%);
	--text: hsl(200 5% 80%);
	--hero-h: calc(100vh - 40px);

	background-color: var(--surface);
	color: var(--text);
	block-size: 100%;
}

body {
	--background-color: #316760;
	touch-action: none;
	font-family: "Orbitron", sans-serif;
	background: url(https://i.imgur.com/Xn1UNWn.jpg) no-repeat center/cover;
	min-block-size: 100%;
	min-inline-size: 100%;
	margin: 0;
	box-sizing: border-box;
	font-family: system-ui, sans-serif;
	overflow-y: auto;
	display: grid;
	place-content: center;
}

.tool-bar {
	position: fixed;
	display: grid;
	max-width: 320px;
	width: 100%;
	padding: 1rem;
	right: 1ch;
	background-color: rgba(#161a20, 1);
	border-radius: 0 0 1ch 1ch;
	z-index: 3;
	box-shadow: var(--shadow-elevation-high);

	input {
		width: 100%;
	}

	&:has(details:not(details[open])) {
		width: auto;
	}
}

:root {
	--shadow-color: 0deg 0% 9%;
	--shadow-elevation-low: 0.3px 0.5px 0.7px hsl(var(--shadow-color) / 0.34),
		0.4px 0.8px 1px -1.2px hsl(var(--shadow-color) / 0.34),
		1px 2px 2.5px -2.5px hsl(var(--shadow-color) / 0.34);
	--shadow-elevation-medium: 0.3px 0.5px 0.7px hsl(var(--shadow-color) / 0.36),
		0.8px 1.6px 2px -0.8px hsl(var(--shadow-color) / 0.36),
		2.1px 4.1px 5.2px -1.7px hsl(var(--shadow-color) / 0.36),
		5px 10px 12.6px -2.5px hsl(var(--shadow-color) / 0.36);
	--shadow-elevation-high: 0.3px 0.5px 0.7px hsl(var(--shadow-color) / 0.34),
		1.5px 2.9px 3.7px -0.4px hsl(var(--shadow-color) / 0.34),
		2.7px 5.4px 6.8px -0.7px hsl(var(--shadow-color) / 0.34),
		4.5px 8.9px 11.2px -1.1px hsl(var(--shadow-color) / 0.34),
		7.1px 14.3px 18px -1.4px hsl(var(--shadow-color) / 0.34),
		11.2px 22.3px 28.1px -1.8px hsl(var(--shadow-color) / 0.34),
		17px 33.9px 42.7px -2.1px hsl(var(--shadow-color) / 0.34),
		25px 50px 62.9px -2.5px hsl(var(--shadow-color) / 0.34);
}

@keyframes waviy {
	0%,
	20%,
	40% {
		transform: translateY(0);
	}
	10% {
		transform: translateY(-1ch);
	}
}

.more-pens {
	position: absolute;
	bottom: 0;
	display: flex;
	gap: 1ch;
	padding: 1ch;
	max-height: 128px;
	filter: drop-shadow(0 0 1rem #0008);
	z-index: 2;

	a {
		display: flex;
		justify-content: center;
		img {
			display: block;
			max-width: 100%;
			height: auto;
			transition: all ease-in-out 0.3s;
		}
		&:hover {
			img {
				transform: scale(1.1);
			}
		}
	}
}
!

JS 

              
                const SIZE = 16;
let moveStep = SIZE;
const MAGNETIC_DEGS = [];

sizeInput.oninput = (e) => sizeInputHandler();
canvaSizeInput.oninput = (e) => canvaSizeInputHandler();
// canvaColorInput.oninput = (e) => canvaColorInputHandler();

function canvaColorInputHandler() {
	const v = canvaColorInput.value;

	canva.setAttribute("flood-color", v);
	resetFilter();
}

function canvaSizeInputHandler() {
	const v = magnetic(MAGNETIC_DEGS, parseInt(canvaSizeInput.value));

	movableDiv.style.setProperty("width", v + "px");
}
async function sizeInputHandler() {
	const x = magnetic(MAGNETIC_DEGS, parseInt(sizeInput.value));
	sizeInput.value = x;

	changeSize(x);

	// window.dispatchEvent(new Event('resize'));
	resetFilter();
}

function sleep(ms) {
	return new Promise((resolve) => setTimeout(resolve, ms));
}

async function resetFilter() {
	movableDiv.style.setProperty("backdrop-filter", "none");
	await sleep(10);
	movableDiv.style.setProperty("backdrop-filter", "url(#led-screen)");
}

const div = document.getElementById("movableDiv");

let startX = 0;
let startY = 0;

function moveDiv(event) {
	var x = event.clientX;
	var y = event.clientY;
	// div.style.left = x + "px";
	// div.style.top = y + "px";

	if (Math.abs(startX - x) > moveStep) {
		div.style.left = x + "px";
		startX = x;
	}
	if (Math.abs(startY - y) > moveStep) {
		div.style.top = y + "px";
		startY = y;
	}
}

document.addEventListener("pointermove", moveDiv);

//
//
//

const filterPxl = document.querySelector("#filterPxl");
const filterCs = document.querySelector("#filterCs");
const filterCsImg = document.querySelector("#filterCsImg");
const filterCsImg2 = document.querySelector("#filterCsImg2");
const filterMorph = document.querySelector("#filterMorph");

function changeSize(size) {
	const pxl = size % 2 == 0 ? 2 : 1;
	const shift = (size - pxl) / 2;
	console.clear();
	console.log(size, pxl, shift);

	filterMorph.setAttribute("radius", (shift - size * 0.04).toString());

	filterPxl.setAttribute("x", shift.toString());
	filterPxl.setAttribute("y", shift.toString());
	filterPxl.setAttribute("width", pxl.toString());
	filterPxl.setAttribute("height", pxl.toString());

	filterCs.setAttribute("width", size.toString());
	filterCs.setAttribute("height", size.toString());

	filterCsImg.setAttribute("width", size.toString());
	filterCsImg.setAttribute("height", size.toString());
	// filterCsImg2.setAttribute("width", size.toString());
	// filterCsImg2.setAttribute("height", size.toString());

	moveStep = size;
}

changeSize(SIZE);

function magnetic(array, value, range = 10) {
	for (let i = 0; i < array.length; i++) {
		const magnetValue = array[i];
		const magnetMax = magnetValue + range;
		const magnetMin = magnetValue - range;

		if (value < magnetMax && value > magnetMin) return magnetValue;
	}

	return value;
}
!
999px

Console