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HTML

              
                <input class="pristine" type="checkbox" name="toggle" value="on">
              
            
!

CSS

              
                * {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
body, input {
	font: 80px/1.5 sans-serif;
}
body, input[type=checkbox]:before {
	background-image:
		linear-gradient(90deg,#f1f2f3 2px,#f1f2f300 2px),
		linear-gradient(#f1f2f3 2px,#fff 2px);
	background-repeat: repeat;
	background-size: 0.75em 0.375em;
}
body {
	background-position: 50% calc(50% + 0.2em);
	display: grid;
	place-items: center;
	height: 100vh;
}
input[type=checkbox] {
	--off: #c7cad1;
	--mid: #829ad6;
	--on: #255ff4;
	--transDur: 0.5s;
	--timing: cubic-bezier(0.6,0,0.4,1);
	animation: bgOff var(--transDur) var(--timing);
	background-color: var(--off);
	border-radius: 0.67em / 0.5em;
	box-shadow:
		0 0.05em 0.1em #00000007 inset,
		0 -0.25em 0.25em #0001 inset,
		0 -0.5em 0 #0001 inset,
		0 0.1em 0.1em #0001;
	cursor: pointer;
	position: relative;
	width: 2.25em;
	height: 1.5em;
	-webkit-appearance: none;
	appearance: none;
	-webkit-tap-highlight-color: transparent;
}
input[type=checkbox]:before {
	animation: handleOff var(--transDur) var(--timing);
	background-attachment: fixed;
	background-position: 50% calc(50% - 0.1875em);
	border-radius: 0.5em / 0.375em;
	box-shadow:
		0 0.175em 0.175em 0 #0001 inset,
		0 0.375em 0 #0002 inset,
		0 0.375em 0 var(--off) inset,
		0 0.475em 0.1em #0001 inset;
	content: "";
	display: block;
	position: absolute;
	top: 0.125em;
	left: 0.125em;
	width: 1em;
	height: 0.75em;
}
input[type=checkbox]:checked {
	animation: bgOn var(--transDur) var(--timing) forwards;
}
input[type=checkbox]:checked:before {
	animation: handleOn var(--transDur) var(--timing) forwards;
}
input[type=checkbox]:focus {
	outline: none;
}
input[type=checkbox].pristine, input[type=checkbox].pristine:before {
	animation: none;
}
/* Dark mode */
@media (prefers-color-scheme: dark) {
	body, input[type=checkbox]:before {
		background-image:
			linear-gradient(90deg,#3a3d46 2px,#3a3d4600 2px),
			linear-gradient(#3a3d46 2px,#2e3138 2px);
	}
	input[type=checkbox] {
		--off: #5c6270;
		--mid: #3d5fb6;
	}
}
/* Animations */
@keyframes bgOff {
	from {
		background-color: var(--on);
	}
	50% {
		background-color: var(--mid);
	}
	to {
		background-color: var(--off);
	}
}
@keyframes bgOn {
	from {
		background-color: var(--off);
	}
	50% {
		background-color: var(--mid);
	}
	to {
		background-color: var(--on);
	}
}
@keyframes handleOff {
	from {
		box-shadow:
			0 0.175em 0.175em 0 #0001 inset,
			0 0.375em 0 #0002 inset,
			0 0.375em 0 var(--on) inset,
			0 0.475em 0.1em #0001 inset;
		left: 1.125em;
		width: 1em;
	}
	50% {
		box-shadow:
			0 0.175em 0.175em 0 #0001 inset,
			0 0.375em 0 #0002 inset,
			0 0.375em 0 var(--mid) inset,
			0 0.475em 0.1em #0001 inset;
		left: 0.125em;
		width: 2em;
	}
	to {
		box-shadow:
			0 0.175em 0.175em 0 #0001 inset,
			0 0.375em 0 #0002 inset,
			0 0.375em 0 var(--off) inset,
			0 0.475em 0.1em #0001 inset;
		left: 0.125em;
		width: 1em;
	}
}
@keyframes handleOn {
	from {
		box-shadow:
			0 0.175em 0.175em 0 #0001 inset,
			0 0.375em 0 #0002 inset,
			0 0.375em 0 var(--off) inset,
			0 0.475em 0.1em #0001 inset;
		left: 0.125em;
		width: 1em;
	}
	50% {
		box-shadow:
			0 0.175em 0.175em 0 #0001 inset,
			0 0.375em 0 #0002 inset,
			0 0.375em 0 var(--mid) inset,
			0 0.475em 0.1em #0001 inset;
		left: 0.125em;
		width: 2em;
	}
	to {
		box-shadow:
			0 0.175em 0.175em 0 #0001 inset,
			0 0.375em 0 #0002 inset,
			0 0.375em 0 var(--on) inset,
			0 0.475em 0.1em #0001 inset;
		left: 1.125em;
		width: 1em;
	}
}
              
            
!

JS

              
                // for removing the `pristine` class that prevents CSS animation on load
document.addEventListener("click",e => {
	let tar = e.target;
	if (tar.name == "toggle")
		tar.removeAttribute("class");
});
              
            
!
999px

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