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HTML

              
                <label>
	<input class="pristine" type="checkbox" name="switch" value="on">
</label>
              
            
!

CSS

              
                body {
	background: linear-gradient(#fff,#c7cad1);
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
	margin: 0;
}
label, label:before, input[type=checkbox]:before, input[type=checkbox]:after {
	box-sizing: border-box;
	display: block;
}
label {
	--transDur: 0.2s;
	--shadowA: 
		-1.5em 0 1.5em #8d273100,
		1.5em 0 1.5em #8d273100,
		0 0 3em #8d273144,
		0 6.5em 3em #0002;
	--shadowB:
		-1.5em 0 1.5em #8d273100,
		1.5em 0 1.5em #8d273100,
		0 3.25em 3em #8d273144,
		0 6.5em 3em #0002;
	--shadowC:
		-1.5em 0 1.5em #8d273177,
		1.5em 0 1.5em #8d273177,
		0 3.25em 3em #8d273144,
		0 6.5em 3em #0002;
	--shadowD:
		-1.5em 0 1.5em #8d273177,
		1.5em 0 1.5em #8d273177,
		0 6.5em 3em #8d273144,
		0 6.5em 3em #0002;
	--switchOnA:
		linear-gradient(90deg,#ecc0,#ecc 0.05em 0.45em,#ecc0) 50% 50% / 0.5em 4em no-repeat,
		linear-gradient(90deg,#0000,#0002 0.25em 0.75em,#0000) 50% 50% / 1em 4em no-repeat,
		linear-gradient(#0000,#0003 0.25em 4.25em,#0000) 50% 50% / 0.5em 4.5em no-repeat,
		radial-gradient(12em 6em at 0 0,#95001100 25%,#95001100 50%),
		radial-gradient(12em 6em at 100% 0,#95001100 25%,#95001100 50%),
		radial-gradient(100% 75% at center,#ff002c,#ff002c00 50%) 0 0 / 0.6em 0.6em,
		radial-gradient(6em 9em at 50% 10%,#ff002c00,#ff002c00 50%),
		radial-gradient(12em 6em at 0 90%,#ff002c00,#ff002c00 50%),
		radial-gradient(12em 6em at 100% 90%,#ff002c00,#ff002c00 50%),
		radial-gradient(9em 9em at 53% 87.5%,#ffc56400 5%,#ff002c00 20%,#ff002c00 50%),
		linear-gradient(#a90020 87.5%,#d4001d);
	--switchOnB:
		linear-gradient(90deg,#ecc0,#ecc 0.05em 0.45em,#ecc0) 50% 50% / 0.5em 4em no-repeat,
		linear-gradient(90deg,#0000,#0002 0.25em 0.75em,#0000) 50% 50% / 1em 4em no-repeat,
		linear-gradient(#0000,#0003 0.25em 4.25em,#0000) 50% 50% / 0.5em 4.5em no-repeat,
		radial-gradient(12em 6em at 0 0,#950011 25%,#95001100 50%),
		radial-gradient(12em 6em at 100% 0,#950011 25%,#95001100 50%),
		radial-gradient(100% 75% at center,#ff002c,#ff002c00 50%) 0 0 / 0.6em 0.6em,
		radial-gradient(6em 9em at 50% 10%,#ff002c,#ff002c00 50%),
		radial-gradient(12em 6em at 0 90%,#ff002c,#ff002c00 50%),
		radial-gradient(12em 6em at 100% 90%,#ff002c,#ff002c00 50%),
		radial-gradient(9em 9em at 53% 87.5%,#ffc564 5%,#ff002c 20%,#ff002c00 50%),
		linear-gradient(#950011 87.5%,#c10017);
	--switchOffA:
		radial-gradient(4em 4em at center,#ecc0 1.45em,#ecc 1.5em 1.95em,#ecc0 2em),
		radial-gradient(5em 5em at center,#0000 1em,#0002 1.5em 2em,#0000 2.5em),
		radial-gradient(100% 75% at center,#ff002c 25%,#ff002c00 50%) 0 0 / 0.6em 0.6em,
		radial-gradient(4em 12em at 50% 100%,#ff002c00,#ff002c00 50%),
		radial-gradient(12em 6em at 0 10%,#ff002c00,#ff002c00 50%),
		radial-gradient(12em 6em at 100% 10%,#ff002c00,#ff002c00 50%),
		radial-gradient(9em 9em at 50% 12.5%,#ffc56400 5%,#ff002c00 20%,#ff002c00 50%),
		linear-gradient(#c10017,#c10017);
	--switchOffB:
		radial-gradient(4em 4em at center,#ecc0 1.45em,#ecc 1.5em 1.95em,#ecc0 2em),
		radial-gradient(5em 5em at center,#0000 1em,#0002 1.5em 2em,#0000 2.5em),
		radial-gradient(100% 75% at center,#ff002c 25%,#ff002c00 50%) 0 0 / 0.6em 0.6em,
		radial-gradient(4em 12em at 50% 100%,#ff002c,#ff002c00 50%),
		radial-gradient(12em 6em at 0 10%,#ff002c,#ff002c00 50%),
		radial-gradient(12em 6em at 100% 10%,#ff002c,#ff002c00 50%),
		radial-gradient(9em 9em at 50% 12.5%,#ffc564 5%,#ff002c 20%,#ff002c00 50%),
		linear-gradient(#c10017,#c10017);
	border-radius: 0.5em;
	box-shadow:
		0 0.1em 0 #565057,
		0 0 0 0.1em #2e3138,
		0 0 0.2em 0.3em #000 inset,
		0 1em 0.2em 0 #000 inset,
		0 -1em 0.2em 0 #000 inset,
		0.5em 0 0.1em #e7454e inset,
		0.6em 0 0.1em #8d2731 inset,
		-0.5em 0 0.1em #e7454e inset,
		-0.6em 0 0.1em #8d2731 inset,
		0 1.5em 0.2em 0 #800007 inset,
		0 2em 0.2em 0 #8d2731 inset,
		0 3em 0.2em 0 #ff8a90 inset,
		0 4em 0.2em 0 #f8f4f6 inset,
		0 -1.5em 0.3em 0 #a0001c inset,
		0 -2em 0.2em 0 #9f0020 inset,
		0 -3em 0.2em 0 #ae1433 inset,
		0 -3.5em 0.2em 0 #941028 inset;
	font-size: calc(12px + 6 * (100vw - 320px) / (1280 - 320));
	margin: 1.5em;
	position: relative;
	width: 13em;
	height: 17em;
	-webkit-tap-highlight-color: transparent;
}
label:before {
	background: linear-gradient(#454954,#2a272d);
	border-radius: 0.25em;
	box-shadow:
		0 0 0 0.2em #000 inset,
		0 0.3em 0 0 #737a8c inset;
	content: "";
	margin: auto;
	position: absolute;
	top: -1.5em;
	left: -1.5em;
	width: 16em;
	height: 20em;
	z-index: -1;
}
input[type=checkbox], input[type=checkbox]:before, input[type=checkbox]:after {
	transform-style: preserve-3d;
}
input[type=checkbox] {
	animation: shadowOff var(--transDur) ease-in-out;
	border: 0;
	box-shadow: var(--shadowA);
	cursor: pointer;
	font-size: 1em;
	margin: 0;
	padding: 0;
	position: relative;
	top: 1.5em;
	left: 0.5em;
	width: 12em;
	height: 14em;
	transform: rotateX(-20deg) translateZ(0.75em);
	transition: transform var(--transDur) ease-in-out;
	-webkit-appearance: none;
	appearance: none;
}
input[type=checkbox]:checked {
	animation: shadowOn var(--transDur) ease-in-out;
	box-shadow: var(--shadowD);
	transform: rotateX(20deg) translateZ(0.75em);
}
input[type=checkbox]:before, input[type=checkbox]:after {
	color: #fff;
	content: "";
	filter: brightness(0.7);
	-webkit-filter: brightness(0.7);
	position: absolute;
	text-align: center;
	transition:
	 	box-shadow var(--transDur) ease-in-out,
	 	filter var(--transDur) ease-in-out,
	 	-webkit-filter var(--transDur) ease-in-out;
	width: 100%;
	height: 50%;
}
input[type=checkbox]:before {
	animation: switchBeforeOff var(--transDur) steps(1,start);
	background: var(--switchOnA);
	box-shadow:
		0 0.2em 0 0 #fff0 inset,
		-0.5em -0.5em 0.5em #0000,
		0.5em -0.5em 0.5em #0000;
	top: 0;
	transform: rotateX(-20deg);
	transform-origin: 50% 100%;
	z-index: 1;
}
input[type=checkbox]:after {
	animation: switchAfterOff var(--transDur) steps(1,start);
	background: var(--switchOffA);
	box-shadow:
		0 -0.2em 0 0 #fff0 inset,
		-0.5em 0 0.5em #0007,
		0.5em 0 0.5em #0007;
	top: 50%;
	transform: rotateX(20deg);
	transform-origin: 50% 0%;
}
input[type=checkbox]:checked:before, input[type=checkbox]:checked:after {
	filter: brightness(1);
	-webkit-filter: brightness(1);
}
input[type=checkbox]:checked:before {
	animation: switchBeforeOn var(--transDur) steps(1,start) forwards;
	box-shadow:
		0 0.2em 0 0 #fff inset,
		-0.5em -0.5em 0.5em #0007,
		0.5em -0.5em 0.5em #0007;
}
input[type=checkbox]:checked:after {
	animation: switchAfterOn var(--transDur) steps(1,start) forwards;
	box-shadow:
		0 -0.2em 0 0 #fff7 inset,
		-0.5em 0 0.5em #0000,
		0.5em 0 0.5em #0000;
}
input[type=checkbox]:focus {
	outline: transparent;
}
input[type=checkbox].pristine, input[type=checkbox].pristine:before, input[type=checkbox].pristine:after {
	animation: none;
}

/* Animations */
@keyframes shadowOn {
	from {
		box-shadow: var(--shadowA);
	}
	50% {
		box-shadow: var(--shadowB);
	}
	51% {
		box-shadow: var(--shadowC);
	}
	to {
		box-shadow: var(--shadowD);
	}
}
@keyframes shadowOff {
	from {
		box-shadow: var(--shadowD);
	}
	50% {
		box-shadow: var(--shadowC);
	}
	51% {
		box-shadow: var(--shadowB);
	}
	to {
		box-shadow: var(--shadowA);
	}
}
@keyframes switchBeforeOn {
	from, 50% {
		background: var(--switchOnA);
	}
	to {
		background: var(--switchOnB);
	}
}
@keyframes switchBeforeOff {
	from, 50% {
		background: var(--switchOnB);
	}
	to {
		background: var(--switchOnA);
	}
}
@keyframes switchAfterOn {
	from, 50% {
		background: var(--switchOffA);
	}
	to {
		background: var(--switchOffB);
			
	}
}
@keyframes switchAfterOff {
	from, 50% {
		background: var(--switchOffB);
	}
	to {
		background: var(--switchOffA);
			
	}
}
              
            
!

JS

              
                // for allowing animations after load since they’re initially prevented from firing
document.addEventListener("DOMContentLoaded",function(){
	let s = this.getElementsByName("switch");
	if (s.length)
		s[0].addEventListener("change",function(){
			this.removeAttribute("class");
		});
});
              
            
!
999px

Console