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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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About Vendor Prefixing

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Babel includes JSX processing.

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HTML 

              
                <div id="switch">
  
  <div id="contentwrapper">
    
    <div id="circle"></div>
    
    <div id="stars">
      <div class="star"></div>
      <div class="star"></div>
      <div class="star"></div>
      <div id="shtngstarwrapper">
        <div id="shootingstar"></div>
      </div>
      
    </div>
    
    <div>
      <div class="cloud">
        <div class="cloudpart"></div>
        <div class="cloudpart"></div> 
      </div>
      <div class="cloud">
        <div class="cloudpart"></div>
        <div class="cloudpart"></div> 
      </div>
      <div class="cloud">
        <div class="cloudpart"></div>
        <div class="cloudpart"></div>
        <div class="cloudpart"></div>
      </div>
    </div>
    
  </div>
  
</div>
!

CSS 

              
                body{
  margin: 0;
  user-select: none;
/*   background-color: rgb(135, 206, 250); */
  background-color: rgb(240, 240, 240);
}

#switch{
  
  position: absolute;
  width: 300px;
  height: 120px;
  
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%) scale(1);
  
  border-radius: 70px;
  border-width: 5px;
  border-style: solid;
  border-color: rgb(211, 239, 255);
  
  background-color: rgb(186, 230, 255);
  
  transition: background-color 1s;
  
  box-shadow: 0 0 35px 1px #565656;
  
}

#switch.off{
  
  border-color: rgb(40, 40, 51);
  background-color: rgb(23, 23, 35);
  
}

#contentwrapper{
  
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  
  border-radius: 60px;
  -webkit-border-radius: 60px;
  overflow: hidden;
  
  z-index: 2;
  
}



#circle{
  
  position: absolute;
  width: 70px;
  height: 70px;
  
  left: 0%;
  top: 50%;
  transform: translate(-0%, -50%);
  
  border-radius: 50%;
  
  background-color: rgb(255, 233, 183);
  box-shadow: 0 0 20px 10px rgb(255, 233, 183), 
    0 0 40px 30px rgb(255, 219, 140), 
    0 0 90px 50px rgb(255, 209, 109);
  
  transition: left 2s, transform 2s, width 2s, height 2s, box-shadow 2s, background-color 2s 0.2s;
  z-index: 1;
  
}

#circle::before{
  
  content: "";
  position: absolute;
  width: 12px;
  height: 20px;
  
  left: 13%;
  top: 30%;
  
  border-radius: 50%;
  
  background-color: rgb(183, 188, 187);
  
  box-shadow: 0 0 4px 1px rgb(183, 188, 187), 0 0 10px 6px rgb(192, 198, 197);
  
  opacity: 0;
  transition: opacity 0s;
  
}

#circle::after{
  
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  
  left: 60%;
  top: 75%;
  
  border-radius: 50%;
  
  background-color: rgb(183, 188, 187);
  
  box-shadow: 0 0 3px 1px rgb(183, 188, 187), 0 0 5px 4px rgb(192, 198, 197);
  
  opacity: 0;
  transition: opacity 0s;
  
}

#switch.off #circle{
  
  width: 100px;
  height: 100px;
  
  border-radius: 50%;
  background-color: rgb(237, 242, 241);
  
  left: 100%;
  transform: translate(-100%, -50%);
  
  box-shadow: 0 0 20px 3px rgb(244, 247, 246);
  
}

#switch.off #circle::before{
  
  opacity: 1;
  transition: opacity 2s 0.2s;
  
}

#switch.off #circle::after{
  
  opacity: 1;
  transition: opacity 2s 0.2s;
  
}



.star{
  
  position: absolute;
  width: 6px;
  height: 6px;
  
  left: 80%;
  top: 50%;
  
  border-radius: 50%;
  
  background-color: white;
  box-shadow: 0 0 5px 0px rgb(255,255,255);
  animation: none;
  opacity: 0;
  
}

.star::before{
  
  content: "";
  
  position: absolute;
  width: 20px;
  height: 1px;
  
  left: 50%;
  top: 50%;
  
  transform: translate(-50%,-50%);
  
  border-radius: 50%;

  background-color: white;
  
  box-shadow: 0 0 4px 0px rgb(255,255,255);
  
  animation: growbrighter 1s linear alternate infinite;
  
}

.star::after{
  
  content: "";
  
  position: absolute;
  width: 1px;
  height: 20px;
  
  left: 50%;
  top: 50%;
  
  transform: translate(-50%,-50%);
  
  border-radius: 50%;
  
  background-color: white;
  
  box-shadow: 0 0 4px 0px rgb(255,255,255);
  
  animation: growbrighter 1s linear alternate infinite;
  
}

#switch.off .star{
  
  opacity: 1;
  transition: opacity 2s 1.5s;
  
}

#switch.off #stars .star:nth-of-type(1){
  
  animation: startravel1 15s linear infinite;
  animation-delay: 0.4s;
  
}

#switch.off #stars .star:nth-of-type(2){

  animation: startravel2 12s linear infinite;
  animation-delay: 0.2s;
  
}

#switch.off #stars .star:nth-of-type(3){

  animation: startravel3 18s linear infinite;
  animation-delay: 0s;
  
}

@keyframes growbrighter {
  
  0%{ box-shadow: 0 0 4px 0px rgb(255,255,255); }
  100%{ box-shadow: 0 0 15px 0px rgb(255,255,255);}
  
}

@keyframes startravel1 {
  0%{ transform: rotate(65deg) translate(-80px) scale(1.0); }
  100%{ transform: rotate(-60deg) translate(-80px) scale(1.3); }
}

@keyframes startravel2 { 
  0%{ transform: rotate(27deg) translate(-160px) scale(1.6); }
  100%{ transform: rotate(-25deg) translate(-160px) scale(1.2); } 
}

@keyframes startravel3 {
  
  0%{ transform: rotate(22deg) translate(-200px) scale(1.2); }
  100%{ transform: rotate(-20deg) translate(-200px) scale(0.7); }
}



#shtngstarwrapper{
  
  position: absolute;
  
  transform: translate(200px, -30px) rotate(-30deg);
  
  opacity: 0;
  
}

#shootingstar{
  
  position: absolute;
  width: 25px;
  height: 25px;
  
  border-radius: 50%;
  
  left: 20%;
  top: 50%;
  
  background: radial-gradient(rgba(255, 231, 193, 0.9) 30%, rgba(237, 155, 61, 1));
  box-shadow: -5px 0 20px 2px rgba(237, 155, 61, 0.7), 0 0 15px 5px rgba(237, 155, 61, 0.5);
  
}

#shootingstar::after{
  
  content: "";
  
  position: absolute;
  width: 160px;
  height: 15px;
  
  border-top-right-radius:70%;
  border-bottom-right-radius: 70%;
  border-top-left-radius: 10px;
  border-bottom-left-radius: 10px;
  
  top: 50%;
  transform: translate(0,-50%);
  
  background: radial-gradient(rgba(255, 231, 193, 0.9) 1%, rgba(237, 155, 61, 0.9));
  box-shadow: 10px 0 10px 1px rgba(237, 155, 61, 0.5), 
    0px 3px 15px 5px rgba(237, 155, 61, 0.5), 
    0px -3px 15px 5px rgba(237, 155, 61, 0.5);
  z-index: -1;
  
}

#switch.off #shtngstarwrapper{
  
  animation: shootingstartravel 24s linear infinite;
  animation-delay: 6s;
  
  opacity: 1;
  transition: opacity 0s 2s;
  
}

#switch.off #shootingstar::after{
  
  animation: growtrail 24s linear infinite;
  animation-delay: 6s;
  
}

@keyframes shootingstartravel{ 
  0%{ transform: translate(200px, -30px) rotate(-30deg); }
  8.33%{ transform: translate(-180px, 170px) rotate(-30deg);} 
  100%{ transform: translate(-180px, 170px) rotate(-30deg);}
}

@keyframes growtrail{
  0%{ width: 40px; }
  8.33%{ width: 180px; }
  100%{ width: 180px; }
}



.cloud:nth-of-type(1){
  
  position: absolute;
  width: 50px;
  height: 55px; 
  
  left: -80px;
  top: 5px;
  
  border-radius: 50%;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
  z-index: 2;
  opacity: 1;
  
  transition: opacity 2s 0.4s;
  animation: cloudtravel1 22s linear infinite;
  animation-delay: 5.4s;
  
}

.cloud:nth-of-type(1)::before{
  
  content: "";
   
  position: absolute;
  width: 30px;
  height: 20px;
  
  left: -55%;
  top: 70%;
  transform: translate(100%,-0%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}

.cloud:nth-of-type(1)::after{
  
  content: "";
   
  position: absolute;
  width: 40px;
  height: 30px;
  
  left: 100%;
  top: 50%;
  transform: translate(-70%,-0%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}

.cloud:nth-of-type(1) .cloudpart:nth-of-type(1){
  
  content: "";
   
  position: absolute;
  width: 60px;
  height: 45px;
  
  left: -100%;
  bottom: 0%;
  transform: translate(40%, -0%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 2;
  
}

.cloud:nth-of-type(1) .cloudpart:nth-of-type(2){
  
  content: "";
   
  position: absolute;
  width: 40px;
  height: 40px;
  
  left: 100%;
  bottom: 0%;
  transform: translate(-50%, -0%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 2;
  
}

.cloud:nth-of-type(1) .cloudpart:nth-of-type(1)::after{
  
  content: "";
   
  position: absolute;
  width: 55px;
  height: 35px;
  
  left: 50%;
  top: 50%;
  transform: translate(-35%,-50%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}

.cloud:nth-of-type(1) .cloudpart:nth-of-type(2)::before{
  
  content: "";
   
  position: absolute;
  width: 45px;
  height: 40px;
  
  left: -50%;
  top: 50%;
  transform: translate(20%,-70%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}



.cloud:nth-of-type(2){
  
  position: absolute;
  width: 55px;
  height: 50px;
 
  left: -90px;
  top: 26px;
  
  border-radius: 50%;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
  z-index: 2;
  opacity: 1;
  
  transition: opacity 2s 0.4s;
  animation: cloudtravel2 18s linear infinite;
  animation-delay: 1.2s;
  
}

.cloud:nth-of-type(2)::before{
  
  content: "";
   
  position: absolute;
  width: 30px;
  height: 20px;
  
  left: -55%;
  top: 70%;
  transform: translate(100%,-30%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}

.cloud:nth-of-type(2)::after{
  
  content: "";
   
  position: absolute;
  width: 40px;
  height: 30px;
  
  left: 50%;
  top: 50%;
  transform: translate(-50%,-40%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}

.cloud:nth-of-type(2) .cloudpart:nth-of-type(1){
  
  content: "";
   
  position: absolute;
  width: 55px;
  height: 45px;
  
  left: -100%;
  bottom: 0%;
  transform: translate(50%, -0%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 2;
  
}

.cloud:nth-of-type(2) .cloudpart:nth-of-type(2){
  
  content: "";
   
  position: absolute;
  width: 50px;
  height: 40px;
  
  left: 100%;
  bottom: 0%;
  transform: translate(-50%, -0%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 2;
  
}

.cloud:nth-of-type(2) .cloudpart:nth-of-type(1)::after{
  
  content: "";
   
  position: absolute;
  width: 55px;
  height: 30px;
  
  left: 50%;
  top: 50%;
  transform: translate(-35%,-20%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}

.cloud:nth-of-type(2) .cloudpart:nth-of-type(2)::before{
  
  content: "";
   
  position: absolute;
  width: 50px;
  height: 35px;
  
  left: -50%;
  top: 50%;
  transform: translate(10%,-40%);
  
  border-radius: 50%;
  
  background: inherit;
  
  z-index: 3;
  
}



.cloud:nth-of-type(3){
  
  position: absolute;
  width: 50px;
  height: 40px;
  
  left: -100px;
  top: 48px;
  
  border-radius: 50%;
  
  z-index: 3;
  opacity: 1;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
  transition: opacity 2s 0.4s;
  animation: cloudtravel3 30s linear infinite;
  animation-delay: 8.6s;
  
}

.cloud:nth-of-type(3)::before{
  
  content: "";
  position: absolute;
  width: 40px;
  height: 30px;
  
  left: -50%;
  top: 50%;
  
  transform: translate(25%, -30%);
  
  border-radius: 50%;
  
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3)::after{
  
  content: "";
  position: absolute;
  width: 40px;
  height: 25px;
  
  left: 50%;
  top: 50%;
  
  transform: translate(5%, -60%);
  
  border-radius: 50%;
  
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(1){
  
  position: absolute;
  width: 45px;
  height: 35px;
  
  left: -50%;
  top: 50%;
  
  border-radius: 50%;
  
  z-index: 2;
  
  transform: translate(0%, -40%);
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(1)::before{
  
  content: "";
  position: absolute;
  
  width: 30px;
  height: 20px;
  
  left: -30%;
  top: 50%;
  
  transform: translate(-0%, -60%);
  
  border-radius: 50%;
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(1)::after{
  
  content: "";
  position: absolute;
  
  width: 20px;
  height: 15px;
  
  left: 0%;
  top: 50%;
  
  transform: translate(-0%, 10%);
  
  border-radius: 50%;
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(2){
  
  position: absolute;
  width: 50px;
  height: 45px;
  
  left: 50%;
  top: 50%;
  
  border-radius: 50%;
  
  z-index: 2;
  
  transform: translate(10%, -20%);
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(2)::before{
  
  content: "";
  position: absolute;
  
  width: 35px;
  height: 25px;
  
  left: 50%;
  top: 50%;
  
  transform: translate(-50%, -50%);
  
  border-radius: 50%;
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(2)::after{
  
  content: "";
  position: absolute;
  
  width: 35px;
  height: 25px;
  
  left: 60%;
  top: 50%;
  
  transform: translate(-0%, -40%);
  
  border-radius: 50%;
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(3){
  
  position: absolute;
  width: 55px;
  height: 40px;
  
  left: 50%;
  top: 50%;
  
  border-radius: 50%;
  
  z-index: 2;
  
  transform: translate(-50%, -10%);
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}

.cloud:nth-of-type(3) .cloudpart:nth-of-type(3)::before{
  
  content: "";
  position: absolute;
  
  width: 40px;
  height: 25px;
  
  left: -50%;
  top: 50%;
  
  transform: translate(40%, -30%);
  
  border-radius: 50%;
  z-index: 3;
  
  background: radial-gradient(rgb(255, 255, 255) 30%, 
rgb(230, 230, 230));
  
}



#switch.off .cloud:nth-of-type(1){
  
  animation: none;
  opacity: 0;
  transition: opacity 1s 0s;
  
}

#switch.off .cloud:nth-of-type(2){
  
  animation: none;
  opacity: 0;
  transition: opacity 1s 0s;
  
}

#switch.off .cloud:nth-of-type(3){
  
  animation: none;
  opacity: 0;
  transition: opacity 1s 0s;
  
}



@keyframes cloudtravel1{
  
  0%{ left: -80px; transform: scale(1); }
  100%{ left: 330px; transform: scale(0.8); }
  
}

@keyframes cloudtravel2{
  
  0%{ left: -90px; transform: scale(0.6); }
  100%{ left: 330px; transform: scale(1); }
  
}

@keyframes cloudtravel3{
  
  0%{ left: -100px; transform: scale(0.7); }
  100%{ left: 340px; transform: scale(0.65); }
  
}
!

JS 

              
                var switchBody = document.getElementById("switch");
//"hsl(238, 50%, 12%)";

switchBody.addEventListener("click", toggle);

function toggle(){
  switchBody.classList.toggle("off");
  
   document.body.style.transition="background-color 2s";
  
  if(switchBody.classList.contains("off")){
    // document.body.style.backgroundColor="rgb(10, 11, 31)";
    document.body.style.backgroundColor="rgb(31, 31, 31)"
    
  }
  else{
    // document.body.style.backgroundColor="rgb(135, 206, 250)";
    document.body.style.backgroundColor="rgb(240, 240, 240)"
  }
  // rgb(31, 31, 31)
  // rgb(255, 255, 255)
}
!
999px

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