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HTML

              
                <div class="background">

  <div class="checkbox">
    <input id="theme" type="checkbox">
    <label for="theme"></label>
  </div>


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</div>
              
            
!

CSS

              
                html {
  background: #1b1b1b;
}

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

.checkbox {
  position: absolute;
  top: 30px;
  right: 13px;
  z-index: 100000;
}

.checkbox span {
  transition: transform 300ms ease-in-out 200ms, 
              opacity 300ms ease-in-out 200ms;
}

.checkbox input {
  display: block;
  -webkit-appearance: none;
  width: 70px;
  border-bottom: 0;
}

.checkbox label {
  background: rgba(255, 255, 255, 0.6);
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto;
  width: 100%;
  height: 30px;
  content: "";
  border-radius: 10px;
}

.checkbox label:hover span {
  transform: translate3d(0, 0, 0);
  opacity: 1;
}

.checkbox label:after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 5px;
  margin: auto;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: white;
  content: "";
  transition: left 350ms linear, background 350ms ease-in-out;
}

.checkbox input:checked + label:after {
  left: calc(100% - 25px);
  background: #1b1b1b;
}


.background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  width: 500px;
  height: 500px;
  background-image: linear-gradient(-180deg, #D95141 0%, #FACC7A 52%);
  overflow: hidden;
  border-radius: 10px;
}

.background::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  content: "";
  background: #27214c;
  opacity: 0;
  transition: opacity 1500ms ease-in-out;
}

.background::before {
  position: absolute;
  top: 100px;
  left: 0;
  right: 0;
  margin: auto;
  width: 440px;
  height: 440px;
  background: linear-gradient(-180deg, rgba(225, 225, 225, 0.4), transparent);
  content: "";
  z-index: 1000;
  border-radius: 100%;
  transform: translate3d(0, 0, 0);
  opacity: 1;
  transition: transform 3500ms ease-in-out, opacity 3500ms ease-in-out;
}

.dark .background::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  content: "";
  opacity: 1;
}

.dark .background::before {
  transform: translate3d(0, 60px, 0);
  opacity: 0;
}

.background svg {
  position: relative;
  z-index: 10000;
}
              
            
!

JS

              
                const themeValue = JSON.parse(localStorage.getItem('darkTheme'))
const theme      = document.getElementById('theme')
const html       = document.documentElement

themeValue ? html.classList.add('dark') : html.classList.remove('dark')

theme.addEventListener('click', function () {
  localStorage.setItem('darkTheme', theme.checked)
  theme.checked ? html.classList.add('dark') : html.classList.remove('dark')
})

theme.checked = themeValue

              
            
!
999px

Console