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html

css

* {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--bg: #e3e4e8;
	--fg: #17181c;
	--bs1: #ffffff;
	--bs2: #c1c2c5;
	--tick: #454954;
	--transDur: 0.1s;
	font-size: calc(20px + (40 - 20)*(100vw - 320px)/(2560 - 320));
}
body, input {
	color: var(--fg);
	font: 1em/1.5 Muli, sans-serif;
}
body, .range__ticks {
	display: flex;
}
body {
	background-color: var(--bg);
	display: flex;
	height: 100vh;
}
form {
	margin: auto;
	max-width: 15em;
	padding: 0 1.5em;
	width: 100%;
}
label {
	display: block;
	font-weight: bold;
}
input[type=range], label {
	-webkit-tap-highlight-color: transparent;
}
input[type=range], .range {
	border-radius: 0.75em;
	overflow: hidden;
	margin-bottom: 1.5em;
}
input[type=range] {
	background-color: transparent;
	box-shadow:
		0.3em 0.3em 0.4em var(--bs2) inset,
		-0.3em -0.3em 0.4em var(--bs1) inset;
	display: block;
	padding: 0 0.1em;
	width: 100%;
	height: 1.5em;
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
}
input[type=range]:focus {
	outline: transparent;
}
input[type=range]::-webkit-slider-thumb {
	background-color: #255ff4;
	border: 0;
	border-radius: 50%;
	box-shadow:
		-0.3em -0.3em 0.5em #0937aa inset,
		0 -0.2em 0.2em 0 #0004,
		0.3em 0.9em 0.8em #0007;
	cursor: pointer;
	position: relative;
	width: 1.3em;
	height: 1.3em;
	transition: all var(--transDur) linear;
	z-index: 1;
	-webkit-appearance: none;
	appearance: none;
}
input[type=range]:focus::-webkit-slider-thumb {
	background-color: #5583f6;
	box-shadow:
		-0.3em -0.3em 0.5em #0b46da inset,
		0 -0.2em 0.2em 0 #0004,
		0.3em 0.9em 0.8em #0007;
}
input[type=range]::-moz-range-thumb {
	background-color: #255ff4;
	border: 0;
	border-radius: 50%;
	box-shadow:
		-0.3em -0.3em 0.5em #0937aa inset,
		0 -0.2em 0.2em 0 #0004,
		0.3em 0.9em 0.8em #0007;
	cursor: pointer;
	position: relative;
	width: 1.3em;
	height: 1.3em;
	transform: translateZ(1px);
	transition: all var(--transDur) linear;
	z-index: 1;
	-moz-appearance: none;
	appearance: none;
}
input[type=range]:focus::-moz-range-thumb {
	background-color: #5583f6;
	box-shadow:
		-0.3em -0.3em 0.5em #0b46da inset,
		0 -0.2em 0.2em 0 #0004,
		0.3em 0.9em 0.8em #0007;
}
input[type=range]::-moz-focus-outer {
	border: 0;
}
.range {
	position: relative;
	height: 1.5em;
}
.range__ticks {
	justify-content: space-between;
	align-items: center;
	pointer-events: none;
	position: absolute;
	top: 0;
	left: 0.75em;
	width: calc(100% - 1.5em);
	height: 100%;
}
.range__tick, .range__tick-text {
	display: inline-block;
}
.range__tick {
	color: var(--tick);
	font-size: 0.5em;
	text-align: center;
	width: 0;
	-webkit-user-select: none;
	-moz-user-select: none;
	user-select: none;
}
.range__tick-text {
	transform: translateX(-50%);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
	:root {
		--bg: #2e3138;
		--fg: #e3e4e8;
		--bs1: #3c4049;
		--bs2: #202227;
		--tick: #c7cad1;
	}
}

JavaScript

window.addEventListener("DOMContentLoaded",() => {
	let range1 = new NeumorphicRange({
			element: "#range1",
			tick: 1
		}),
		range2 = new NeumorphicRange({
			element: "#range2",
			tick: 4
		}),
		range3 = new NeumorphicRange({
			element:"#range3",
			tick: 10
		});
});

class NeumorphicRange {
	constructor(args) {
		this.el = document.querySelector(args.element);
		this.min = +this.el.min || 0;
		this.max = +this.el.max || 100;
		this.step = +this.el.step || 1;
		this.tick = args.tick || this.step;
		this.addTicks();
	}
	addTicks() {
		// div to contain everything
		let wrap = document.createElement("div");
		wrap.className = "range";
		this.el.parentElement.insertBefore(wrap,this.el);
		wrap.appendChild(this.el);

// div to contain the ticks
		let ticks = document.createElement("div");
		ticks.className = "range__ticks";
		wrap.appendChild(ticks);

// draw the ticks
		for (let t = this.min; t <= this.max; t += this.tick) {
			// zero-width span to allow proper space between each tick
			let tick = document.createElement("span");
			tick.className = "range__tick";
			ticks.appendChild(tick);

let tickText = document.createElement("span");
			tickText.className = "range__tick-text";
			tick.appendChild(tickText);
			tickText.textContent = t;
		}
	}
}

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