A Code by PNL

HTML

CSS

body {
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.theme-switch {
  --toggle-size: 30px;
  --container-width: 5.625em;
  --container-height: 2.5em;
  --container-light-bg: #3D7EAE;
  --circle-container-diameter: 3.375em;
  --sun-moon-diameter: 2.125em;
  --sun-bg: #ECCA2F;
  --moon-bg: #C4C9D1;
  --spot-color: #959DB1;
  --circle-container-offset: calc((var(--circle-container-diameter) - var(--container-height)) / 2 * -1);
}

.theme-switch,
.theme-switch *,
.theme-switch *::before,
.theme-switch *::after {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-size: 30px;
}

.container {
  width: 5.625em;
  height: var(--container-height);
  background-color: var(--container-light-bg);
  border-radius: 6.25em;
  overflow: hidden;
  cursor: pointer;
  -webkit-box-shadow: 0em -0.062em 0.062em rgba(0, 0, 0, 0.25), 0em 0.062em 0.125em rgba(255, 255, 255, 0.94);
  box-shadow: 0em -0.062em 0.062em rgba(0, 0, 0, 0.25), 0em 0.062em 0.125em rgba(255, 255, 255, 0.94);
  -webkit-transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  -o-transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  position: relative;
}

.container::before {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  -webkit-box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset, 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset;
  box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset, 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset;
}

.checkbox {
  display: none;
}

.circle-container {
  width: 3.375em;
  height: 3.375em;
  background-color: rgba(255, 255, 255, 0.1);
  position: absolute;
  left: var(--circle-container-offset);
  top: var(--circle-container-offset);
  border-radius: 6.25em;
  -webkit-box-shadow: inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), 0 0 0 0.625em rgba(255, 255, 255, 0.1), 0 0 0 1.25em rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), 0 0 0 0.625em rgba(255, 255, 255, 0.1), 0 0 0 1.25em rgba(255, 255, 255, 0.1);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-transition: .3s cubic-bezier(0, -0.02, 0.35, 1.17);
  -o-transition: .3s cubic-bezier(0, -0.02, 0.35, 1.17);
  transition: .3s cubic-bezier(0, -0.02, 0.35, 1.17);
  pointer-events: none;
}

.sun-moon-container {
  pointer-events: auto;
  position: relative;
  z-index: 2;
  width: var(--sun-moon-diameter);
  height: var(--sun-moon-diameter);
  margin: auto;
  border-radius: 6.25em;
  background-color: var(--sun-bg);
  -webkit-box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #a1872a inset;
  box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #a1872a inset;
  -webkit-filter: drop-shadow(0.062em 0.125em 0.125em rgba(0, 0, 0, 0.25)) drop-shadow(0em 0.062em 0.125em rgba(0, 0, 0, 0.25));
  filter: drop-shadow(0.062em 0.125em 0.125em rgba(0, 0, 0, 0.25)) drop-shadow(0em 0.062em 0.125em rgba(0, 0, 0, 0.25));
  overflow: hidden;
  -webkit-transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  -o-transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
}

.moon {
  -webkit-transform: translateX(100%);
  -ms-transform: translateX(100%);
  transform: translateX(100%);
  width: 100%;
  height: 100%;
  background-color: var(--moon-bg);
  border-radius: inherit;
  -webkit-box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #969696 inset;
  box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #969696 inset;
  -webkit-transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  -o-transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
  ;
  position: relative;
}

.spot {
  position: absolute;
  top: 0.75em;
  left: 0.312em;
  width: 0.75em;
  height: 0.75em;
  border-radius: 6.25em;
  background-color: var(--spot-color);
  -webkit-box-shadow: 0em 0.0312em 0.062em rgba(0, 0, 0, 0.25) inset;
  box-shadow: 0em 0.0312em 0.062em rgba(0, 0, 0, 0.25) inset;
}

.spot:nth-of-type(2) {
  width: 0.375em;
  height: 0.375em;
  top: 0.937em;
  left: 1.375em;
}

.spot:nth-last-of-type(3) {
  width: 0.25em;
  height: 0.25em;
  top: 0.312em;
  left: 0.812em;
}

.checkbox:checked+.container {
  background-color: #1D1F2C;
}

.checkbox:checked+.container .circle-container {
  left: calc(100% - var(--circle-container-offset) - var(--circle-container-diameter));
}

.checkbox:checked+.container .circle-container:hover {
  left: calc(100% - var(--circle-container-offset) - var(--circle-container-diameter) - 0.187em)
}

.circle-container:hover {
  left: calc(var(--circle-container-offset) + 0.187em);
}

.checkbox:checked+.container .moon {
  -webkit-transform: translate(0);
  -ms-transform: translate(0);
  transform: translate(0);
}

JS

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