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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="toggle-container">
  <div class="toggle-handle">
    <div class="crater crater-one"></div>
    <div class="crater crater-two"></div>
    <div class="crater crater-three"></div>
  </div>
  <img class="mini-cloud" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/480623/toggle_cloud.png">
  <div class="star star-medium star-one"></div>
  <div class="star star-large star-two"></div>
  <div class="star star-small star-three"></div>
  <div class="star star-small star-four"></div>
  <div class="star star-medium star-five"></div>
  <div class="star star-large star-six"></div>
  <div class="star star-medium star-seven"></div>
</div>
!

CSS 

              
                $height: 140px;
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background: #222;
  transition: background .5s ease 0s;
}
.toggle-container {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  width: $height * 2;
  height: $height;
  background: #3C4145;
  border-radius: $height/2;
  border: ($height * .07143) solid #1C1C1C;
  overflow: hidden;
  cursor: pointer;
  transition: border-color .5s ease 0s, background .5s ease 0s;
  .toggle-handle {
    position: absolute;
    height: $height * .7857;
    width: $height * .7857;
    left: $height * .042857;
    top: 0;
    bottom: 0;
    margin: auto;
    border-radius: 50%;
    background: #FFFFFF;
    border: ($height * .07143) solid #E4E9C8;
    box-shadow: 0px 0px 20px rgba(228, 233, 200, .5);
    z-index: 999;
    transition: left .5s ease 0s, background .5s ease 0s, border-color .5s ease 0s, transform .5s ease 0s;
    .crater {
      position: absolute;
      border: ($height * .07143) solid #E4E9C8;
      border-radius: 50%;
    }
    .crater-one {
      top: 10%;
      left: 3%;
      height: 40%;
      width: 40%;
    }
    .crater-two {
      right: 6%;
      top: 6%;
    }
    .crater-three {
      right: 24%;
      bottom: 10%;
      height: 30%;
      width: 30%;
    }
  }
  .mini-cloud {
    height: 40%;
    width: auto;
    position: absolute;
    left: 20%;
    top: 38%;
    opacity: 0;
    z-index: 999;
    transition: opacity .25s ease 0s, left .5s ease 0s;
  }
  .star {
    position: absolute;
    background: #FFFFFF;
    opacity: 1;
    border-radius: 50%;
    transform: scale(1);
    transition: transform .5s ease;
  }
  .star-small {
    $smallStar: 4%;
    height: $smallStar;
    width: $smallStar/2;
  }
  .star-medium {
    $mediumStar: 6%;
    height: $mediumStar;
    width: $mediumStar/2;
  }
  .star-large {
    $largeStar: 8%;
    height: $largeStar;
    width: $largeStar/2;
  }
  .star-one {
    top: 12%;
    left: 45%;
    transition-delay: .4s;
  }
  .star-two {
    top: 72%;
    left: 50%;
    transition-delay: .35s;
  }
  .star-three {
    top: 30%;
    left: 62%;
    transition-delay: .3s;
  }
  .star-four {
    top: 56%;
    left: 68%;
    transition-delay: .25s;
  }
  .star-five {
    top: 8%;
    left: 76%;
    transition-delay: .2s;
  }
  .star-six {
    top: 40%;
    left: 86%;
    transition-delay: .15s;
  }
  .star-seven {
    top: 70%;
    left: 82%;
    transition-delay: .1s;
  }
}
.toggle-handle-day {
    left: ($height * 2) * .516 !important;
    background: #FFE06E !important;
    border-color: #E2C448 !important;
    transform: rotate(90deg);
  }
.toggle-container-day {
    background: #9FE4FC;
    border-color: #86C4D8;
  }
.off {
  background: #FAFAFA !important;
  transition: background .5s ease 0s;
}
.star-day {
  opacity: 0 !important;
  transform: scale(0) !important;
}
.crater-day {
  width: 0% !important;
  height: 0% !important;
  border: 0px solid transparent !important;
  transition: height .5s ease 0s, width .5s ease 0s, border .5s ease 0s;
}
.cloud-day {
  opacity: 1 !important;
  left: 40% !important;
}
!

JS 

              
                var darkSide = new Audio();
darkSide.src = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/480623/vadar_breathing.mp3";

var lightSide = new Audio();
lightSide.src = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/480623/yoda_use_the_force.mp3";

var clickCount = 0;

$('.toggle-container').on('click', function(){
  $('.toggle-handle').toggleClass('toggle-handle-day');
  $('body').toggleClass('off');
  $('.toggle-container').toggleClass('toggle-container-day');
  $('.star').toggleClass('star-day');
  $('.crater').toggleClass('crater-day');
  $('.mini-cloud').toggleClass('cloud-day');
  if (clickCount === 0){
    clickCount++;
    darkSide.pause();
    lightSide.play();
    return darkSide.currentTime = 0;
  } else if (clickCount === 1){
    clickCount--;
    lightSide.pause();
    darkSide.play();
    return lightSide.currentTime = 0;
  }
});
!
999px

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