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CSS

* {
  border: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --hue: 223;
  --bg: hsl(var(--hue),10%,90%);
  --fg: hsl(var(--hue),10%,10%);
  --trans-dur: 0.5s;
  --trans-timing1: cubic-bezier(0.65,0,0.35,1);
  --trans-timing2: cubic-bezier(0.65,0,0.35,1.5);
  font-size: calc(56px + (120 - 56) * (100vw - 280px) / (3840 - 280));
}

body,
input {
  color: var(--fg);
  font: 1em/1.5 sans-serif;
  transition: background-color var(--trans-dur) var(--trans-timing1), color var(--trans-dur) var(--trans-timing1);
}

body {
  background-color: var(--bg);
  display: flex;
  height: 100vh;
}

.switch {
  display: flex;
  margin: auto;
}
.switch__emoji {
  box-shadow: 0.25em 0.25em 0.125em rgba(0, 0, 0, 0.3);
  overflow: hidden;
  pointer-events: none;
  top: 0.25em;
  left: 0.25em;
  width: 1em;
  height: 1em;
}
[dir=rtl] .switch__emoji {
  right: 0.25em;
  left: auto;
}
.switch__emoji, .switch__emoji:before, .switch__emoji:after, .switch__emoji-eye, .switch__emoji-mouth, .switch__emoji-face {
  display: block;
  position: absolute;
}
.switch__emoji, .switch__emoji:before, .switch__emoji:after, .switch__emoji-eye, .switch__emoji-mouth {
  border-radius: 50%;
}
.switch__emoji:before, .switch__emoji:after {
  content: "";
  width: 100%;
  height: 100%;
  transform: translateZ(0);
}
.switch__emoji:before {
  background-color: #f2c40d;
  box-shadow: -0.25em -0.25em 0.25em #c29d0a inset, 0.1875em 0.1875em 0.25em #f9e286 inset;
}
.switch__emoji:after {
  box-shadow: 0 0 0.125em 0.0625em rgba(245, 208, 61, 0.5) inset;
}
.switch__emoji, .switch__emoji-face {
  transform-style: preserve-3d;
  transition: transform var(--trans-dur) var(--trans-timing2);
}
.switch__emoji-eye, .switch__emoji-mouth {
  backface-visibility: hidden;
}
.switch__emoji-eye {
  border: 0.0625em solid hsl(var(--hue), 10%, 10%);
  border-right-color: transparent;
  border-bottom-color: transparent;
  border-radius: 50%;
  top: 50%;
  left: 50%;
  width: 0.25em;
  height: 0.25em;
  transform: translate(-50%, -50%) rotateY(-22.5deg) translateZ(0.5em) rotateZ(45deg);
}
.switch__emoji-eye + .switch__emoji-eye {
  transform: translate(-50%, -50%) rotateY(22.5deg) translateZ(0.5em) rotateZ(45deg);
}
.switch__emoji-mouth {
  background-image: radial-gradient(100% 100% at 50% 100%, #f2180d 20%, #f5463d 33%, rgba(245, 70, 61, 0) 35%), radial-gradient(100% 100% at 75% 113%, black 26%, rgba(0, 0, 0, 0) 35%), linear-gradient(rgba(0, 0, 0, 0) 50%, black 50% 55%, hsl(var(--hue), 10%, 10%) 65%);
  top: 50%;
  left: 50%;
  width: 0.5em;
  height: 0.5em;
  transform: translate(-50%, -50%) rotateX(-15deg) translateZ(0.5em);
}
.switch__emoji-face {
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotateY(0);
}
.switch__emoji-face + .switch__emoji-face {
  transform: rotateY(-180deg);
}
.switch__emoji-face--sad .switch__emoji-eye {
  background-color: hsl(var(--hue), 10%, 10%);
  border: 0;
  width: 0.1875em;
  height: 0.1875em;
}
.switch__emoji-face--sad .switch__emoji-mouth {
  background-image: none;
  border: 0.0625em solid transparent;
  border-top-color: hsl(var(--hue), 10%, 10%);
  transform: translate(-50%, 0) rotateX(-20deg) translateZ(0.5em);
}
.switch__input, .switch__label {
  -webkit-tap-highlight-color: transparent;
}
.switch__input {
  background-color: hsl(var(--hue), 10%, 80%);
  border-radius: 0.75em;
  box-shadow: 0.0625em 0.0625em 0.0625em white inset, -0.0625em -0.0625em 0.0625em hsl(var(--hue), 10%, 80%) inset, 0 0 0 0.125em hsl(var(--hue), 10%, 90%) inset, 0.25em 0.25em 0.125em rgba(0, 0, 0, 0.3) inset, 0.0625em 0.0625em 0.0625em rgba(0, 0, 0, 0.3);
  cursor: pointer;
  display: block;
  width: 2.5em;
  height: 1.5em;
  -webkit-appearance: none;
  appearance: none;
  transition: background-color var(--trans-dur) var(--trans-timing1), box-shadow var(--trans-dur) var(--trans-timing1);
}
.switch__input:checked {
  background-color: #0ac213;
}
.switch__input:checked + .switch__emoji {
  transform: translateX(100%);
}
[dir=rtl] .switch__input:checked + .switch__emoji {
  transform: translateX(-100%);
}
.switch__input:checked + .switch__emoji .switch__emoji-face {
  transform: rotateY(179.99deg);
}
[dir=rtl] .switch__input:checked + .switch__emoji .switch__emoji-face {
  transform: rotateY(-179.99deg);
}
.switch__input:checked + .switch__emoji .switch__emoji-face + .switch__emoji-face {
  transform: rotateY(0);
}
[dir=rtl] .switch__input:checked + .switch__emoji .switch__emoji-face + .switch__emoji-face {
  transform: rotateY(-360deg);
}
.switch__label, .switch__wrapper {
  display: block;
}
.switch__label {
  margin-inline-start: 0.5em;
  overflow: hidden;
  position: absolute;
  width: 1px;
  height: 1px;
}
.switch__wrapper {
  position: relative;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: hsl(var(--hue),10%,10%);
    --fg: hsl(var(--hue),10%,90%);
  }

.switch__input {
    background-color: hsl(var(--hue), 10%, 20%);
    box-shadow: 0.0625em 0.0625em 0.0625em hsl(var(--hue), 10%, 25%) inset, -0.0625em -0.0625em 0.0625em hsl(var(--hue), 10%, 20%) inset, 0 0 0 0.125em hsl(var(--hue), 10%, 30%) inset, 0.25em 0.25em 0.125em rgba(0, 0, 0, 0.3) inset, 0.0625em 0.0625em 0.0625em rgba(0, 0, 0, 0.3);
  }
}

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