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HTML

CSS

* {

border: 0;

box-sizing: border-box;

margin: 0;

padding: 0;

}

:root {

--hue: 223;

--bg: hsl(var(--hue),90%,90%);

--fg: hsl(var(--hue),90%,10%);

--trans-dur: 0.3s;

--trans-timing: cubic-bezier(0.65,0,0.35,1);

font-size: calc(40px + (80 - 40) * (100vw - 320px) / (2560 - 320));

}

body,

input {

font: 1em/1.5 sans-serif;

}

body {

background-color: #234056;

color: var(--fg);

display: grid;

place-items: center;

height: 100vh;

transition:

background-color var(--trans-dur),

color var(--trans-dur);

}

.switch,

.switch__input {

-webkit-tap-highlight-color: transparent;

}

.switch {

position: relative;

width: 3em;

height: 1.5em;

}

.switch__check {

display: block;

transform: translateX(0) rotate(0);

transition: transform var(--trans-dur) var(--trans-timing);

z-index: 1;

}

.switch__check-line {

transform: translate(0,0);

transition:

stroke var(--trans-dur) var(--trans-timing),

stroke-dashoffset var(--trans-dur) var(--trans-timing),

transform var(--trans-dur) var(--trans-timing);

}

.switch__input {

background-color: hsla(var(--hue),90%,50%,0);

border-radius: 1.5em;

box-shadow:

0 0 0 0.0625em hsl(var(--hue),10%,50%) inset,

0 0.25em 1em hsla(var(--hue),90%,10%,0);

cursor: pointer;

display: block;

outline: transparent;

width: 100%;

height: 100%;

transition:

background-color var(--trans-dur) var(--trans-timing),

box-shadow var(--trans-dur) var(--trans-timing);

-webkit-appearance: none;

appearance: none;

}

.switch__input:before,

.switch__input:after {

content: "";

display: block;

}

.switch__input:before {

background-color: hsl(0,0%,100%);

border-radius: 50%;

box-shadow: 0 0.125em 0.25em hsla(var(--hue),90%,10%,0);

transition:

box-shadow var(--trans-dur) var(--trans-timing),

transform var(--trans-dur) var(--trans-timing);

}

.switch__input:after {

border-radius: 0.75em;

box-shadow: 0 0 0 0.125em hsla(var(--hue),90%,70%,0);

width: 100%;

height: 100%;

transition: box-shadow 0.15s linear;

}

.switch__input:focus-visible:after {

box-shadow: 0 0 0 0.125em hsla(var(--hue),90%,70%,1);

}

.switch__check,

.switch__input:before {

position: absolute;

top: 0.25em;

left: 0.25em;

width: 1em;

height: 1em;

}

.switch__input:checked {

background-color: hsla(var(--hue),90%,50%,1);

box-shadow:

0 0 0 0.0625em hsl(var(--hue),90%,50%) inset,

0 0.25em 1em hsla(var(--hue),90%,10%,0.5);

}

.switch__input:checked:before {

box-shadow: 0 0.125em 0.25em hsla(var(--hue),90%,10%,0.5);

transform: translateX(1.5em);

}

.switch__input:checked + .switch__check {

animation: switch-check var(--trans-dur) var(--trans-timing);

transform: translateX(1.5em) rotate(-225deg);

}

.switch__input:checked + .switch__check .switch__check-line {

stroke: hsl(var(--hue),90%,50%);

stroke-dashoffset: 0;

transform: translate(-1px,-1px);

transition-delay: 0s, calc(var(--trans-dur) / 2), 0s;

}

.switch__sr {

overflow: hidden;

position: absolute;

width: 1px;

height: 1px;

}

@media (prefers-color-scheme: dark) {

:root {

--bg: hsl(var(--hue),90%,10%);

--fg: hsl(var(--hue),90%,90%);

}

/* Animations */

@keyframes switch-check {

from {

transform: translateX(0) rotate(0);

}

to {

transform: translateX(1.5em) rotate(135deg);

}

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