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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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!
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CSS

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CSS Base

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HTML 

              
                <div class="capsule-buttons">
  <div class="capsule-button-container">
    <svg class="capsule-button-border" xmlns="http://www.w3.org/2000/svg" width="29" height="29" viewBox="0 0 29 29" fill="none">
    <rect x="0.5" y="0.5" width="28" height="28" stroke="#230E03"/>
    </svg>
    <button class="first capsule-button"></button>
    <button class="second capsule-button"></button>
    <button class="third capsule-button"></button>
    <button class="fourth capsule-button"></button>
  </div>
</div>

<div class="trigger-wrap">
  <section class="black">
    
    <div class="p-wrap p-wrap-1">	
      <a href="/products/black-dress">
        <div class="panel blue">
          <div class="product-info d-none">
            <h5>THE MINI DRESS</h5>
            <div class="price">£400</div>
          </div>
        </div> 
        <div class="panel red"></div>
        <div class="panel orange"></div> 
        <div class="panel purple"></div> 
      </a>
    </div>
    
    <div class="p-wrap p-wrap-2">
      <div class="panel2 blue"></div> 
      <div class="panel2 red"></div>
      <div class="panel2 orange"></div> 
      <div class="panel2 purple"></div> 
    </div>
    <div class="p-wrap p-wrap-3">
      <div class="panel3 blue"></div> 
      <div class="panel3 red"></div>
      <div class="panel3 orange"></div> 
      <div class="panel3 purple"></div> 
    </div>
    <div class="p-wrap p-wrap-4">
      <div class="panel4 blue"></div> 
      <div class="panel4 red"></div>
      <div class="panel4 orange"></div> 
      <div class="panel4 purple"></div> 
    </div>
    <div class="p-wrap p-wrap-5">
      <div class="panel5 blue"></div> 
      <div class="panel5 red"></div>
      <div class="panel5 orange"></div> 
      <div class="panel5 purple"></div> 
    </div>
    <div class="p-wrap p-wrap-6">
      <div class="panel6 blue"></div> 
      <div class="panel6 red"></div>
      <div class="panel6 orange"></div> 
      <div class="panel6 purple"></div> 
    </div>
  </section>
  <div class="text-wrap">
      <div class="panel-text panel-text1 blue-text"><p>Blue</p></div>
      <div class="panel-text panel-text2 red-text"><p>Red</p></div>
      <div class="panel-text panel-text3 orange-text"><p>Orange</p></div>
      <div class="panel-text panel-text4 purple-text"><p>Purple</p></div>
    </div>
</div>
<footer class="footer">
  <ul>
    <li>footer list</li>
    <li>footer list</li>
    <li>footer list</li>
    <li>footer list</li>
    <li>footer list</li>
  </ul>
</footer>
!

CSS 

              
                .trigger-wrap {
  position: relative;
}

section.black {
  width: 100vw;
  height: 100vh;
  position: fixed;
  bottom: 0;
  justify-content: space-around;
  align-items: center;
  background-color: transparent;
  z-index: 999;
  padding-left: 50px;
  padding-right: 50px;
  display: grid;
  grid-template-columns: repeat(12,1fr);
  grid-template-rows: repeat(12,1fr);
  grid-column-gap: 10px;
  grid-row-gap: 10px;
}


.text-wrap {
  position: relative;
  width: 100vw;
}

.panel-text {
  position: relative;
  left: 0%;
  top: 0%;
  right: 0%;
  bottom: 0%;
  z-index: unset;
  width: 100%;
  height: 100vh;
  
  font-size: 200px;
  text-transform: uppercase;
  font-weight: 900;
  background-color: black;  
 
  display: flex;
  align-items: center;
  justify-content: center;
}

.panel-text p { 
  font-size: 300px;
  line-height: 100%;
  font-family: "louizeregular", sans-serif;
  text-transform: uppercase;
  font-weight: 400;
  z-index: 9999;
  pointer-events: none;
}

.panel-text.blue-text {
  color: black;
  background: blue;
}

.panel-text.red-text {
  color: pink;
  background: red;
}

.panel-text.orange-text {
  color: brown;
  background: orange;
}

.panel-text.tomato-text {
  color: pink;
  background: light-pink;
}

.panel-text.purple-text {
  color: yellow;
  background: purple;
}

.p-wrap {
  position: relative;
  overflow: hidden;
  width: 180px;
  height: 209px;
}

.p-wrap-1 {
  grid-area: 4 / 1 / span 5 / span 2;
  margin-left: 60px;
}

.p-wrap-2 {
  grid-area: 3 / 4 / span 5 / span 2;
  margin-left: auto;
}

.p-wrap-3 {
  grid-area: 3 / 8 / span 6 / span 2;
  margin-top: 60px;
}

.p-wrap-4 {
  grid-area: 4 / 11 / span 6 / span 2;

}

.p-wrap-5 {
  grid-area: 8 / 2 / span 5 / span 2;

}

.p-wrap-6 {
  grid-area: 7 / 6 / span 6 / span 2;
  margin-top: 60px;
}

.panel, .panel2, .panel3, .panel4, .panel5, .panel6, .panel7 {
  position: absolute;
  left: 0%;
  top: 0%;
  right: 0%;
  bottom: 0%;
  z-index: 1;
  width: 100%;
  height: 100%;
}


.panel.blue {
  background-color: blue;
  background-image: url("https://ichef.bbci.co.uk/news/999/cpsprodpb/1751E/production/_123881559_02.jpg");
}

.panel.red {
  background-color: red;
  background-image: url("https://st.depositphotos.com/1000848/1312/i/600/depositphotos_13124937-stock-photo-roses-background.jpg");
}

.panel.orange {
  background-color: orange;
  background-image: url("https://media.gettyimages.com/photos/half-of-orange-on-the-heap-of-oranges-picture-id1205638014?s=612x612");
}

.panel.tomato {
  background-color: tomato;
  background-image: url("https://images-prod.healthline.com/hlcmsresource/images/AN_images/tomatoes-1296x728-feature.jpg");
}

.panel.purple {
  background-color: purple;
  background-image: url("https://img.freepik.com/free-vector/purple-watercolor-galaxy-background_23-2149248308.jpg?w=2000");
}




.panel2.blue {
  background-color: blue;
  background-image: url("https://images.unsplash.com/photo-1566228015668-4c45dbc4e2f5?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8NHx8Ymx1ZXxlbnwwfHwwfHw%3D&w=1000&q=80");
}

.panel2.red {
  background-color: red;
  background-image: url("https://upload.wikimedia.org/wikipedia/commons/e/e1/Strawberries.jpg");
}

.panel2.orange {
  background-color: orange;
  background-image: url("https://cdn.britannica.com/24/174524-050-A851D3F2/Oranges.jpg");
}

.panel2.purple {
  background-color: purple;
  background-image: url("https://img.freepik.com/free-vector/abstract-splashed-watercolor-textured-background_53876-8753.jpg?w=2000");
}



.panel3.blue {
  background-color: blue;
  background-image: url("https://images.unsplash.com/photo-1566228015668-4c45dbc4e2f5?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxzZWFyY2h8NHx8Ymx1ZXxlbnwwfHwwfHw%3D&w=1000&q=80");
}

.panel3.red {
  background-color: red;
  background-image: url("https://upload.wikimedia.org/wikipedia/commons/e/e1/Strawberries.jpg");
}

.panel3.orange {
  background-color: orange;
  background-image: url("https://cdn.britannica.com/24/174524-050-A851D3F2/Oranges.jpg");
}

.panel3.purple {
  background-color: purple;
  background-image: url("https://img.freepik.com/free-vector/abstract-splashed-watercolor-textured-background_53876-8753.jpg?w=2000");
}


.panel4.blue {
  background-color: blue;
  background-image: url("https://ichef.bbci.co.uk/news/999/cpsprodpb/1751E/production/_123881559_02.jpg");
}

.panel4.red {
  background-color: red;
  background-image: url("https://st.depositphotos.com/1000848/1312/i/600/depositphotos_13124937-stock-photo-roses-background.jpg");
}

.panel4.orange {
  background-color: orange;
  background-image: url("https://media.gettyimages.com/photos/half-of-orange-on-the-heap-of-oranges-picture-id1205638014?s=612x612");
}

.panel4.tomato {
  background-color: tomato;
  background-image: url("https://images-prod.healthline.com/hlcmsresource/images/AN_images/tomatoes-1296x728-feature.jpg");
}

.panel4.purple {
  background-color: purple;
  background-image: url("https://img.freepik.com/free-vector/purple-watercolor-galaxy-background_23-2149248308.jpg?w=2000");
}


.panel5.blue {
  background-color: blue;
  background-image: url("https://ichef.bbci.co.uk/news/999/cpsprodpb/1751E/production/_123881559_02.jpg");
}

.panel5.red {
  background-color: red;
  background-image: url("https://st.depositphotos.com/1000848/1312/i/600/depositphotos_13124937-stock-photo-roses-background.jpg");
}

.panel5.orange {
  background-color: orange;
  background-image: url("https://media.gettyimages.com/photos/half-of-orange-on-the-heap-of-oranges-picture-id1205638014?s=612x612");
}

.panel5.tomato {
  background-color: tomato;
  background-image: url("https://images-prod.healthline.com/hlcmsresource/images/AN_images/tomatoes-1296x728-feature.jpg");
}

.panel5.purple {
  background-color: purple;
  background-image: url("https://img.freepik.com/free-vector/purple-watercolor-galaxy-background_23-2149248308.jpg?w=2000");
}


.panel6.blue {
  background-color: blue;
  background-image: url("https://ichef.bbci.co.uk/news/999/cpsprodpb/1751E/production/_123881559_02.jpg");
}

.panel6.red {
  background-color: red;
  background-image: url("https://st.depositphotos.com/1000848/1312/i/600/depositphotos_13124937-stock-photo-roses-background.jpg");
}

.panel6.orange {
  background-color: orange;
  background-image: url("https://media.gettyimages.com/photos/half-of-orange-on-the-heap-of-oranges-picture-id1205638014?s=612x612");
}

.panel6.tomato {
  background-color: tomato;
  background-image: url("https://images-prod.healthline.com/hlcmsresource/images/AN_images/tomatoes-1296x728-feature.jpg");
}

.panel6.purple {
  background-color: purple;
  background-image: url("https://img.freepik.com/free-vector/purple-watercolor-galaxy-background_23-2149248308.jpg?w=2000");
}



.capsule-buttons {
  position: fixed;
  top: 82px;
  left: 0;
  right: 0;
  z-index: 99999;
  width: 100vw;
  display: flex;
  justify-content: center;
  background-color: #ffffff;
  border-top: 1px solid #000000;
  border-bottom: 1px solid #000000;
  padding: 8px 0 4px;
}

.capsule-button-container {
  position: relative;
  padding: 5px;
  margin-left: 7px;
  display: flex;
  justify-content: space-between;
  row-gap: 10px;
}

.capsule-button-border {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}

button.capsule-button {
  border: 1px solid #000000;
  height: 19px;
  width: 19px;
  margin-left: 7px;
  margin-right: 7px;
  transition: 0.2s all ease-in-out;
}

button.capsule-button.first {
  margin-left:0;
}

button.capsule-button:hover {
  border: 1px solid #b9b9b9;
}

button.capsule-button.first {
  background: blue;
}

button.capsule-button.second {
  background: red;
}

button.capsule-button.third {
  background: orange;
}

button.capsule-button.fourth {
  background: purple;
!

JS 

              
                $(document).ready(
  function () {
    if ($(".panel")[0]){
      gsap.registerPlugin(ScrollTrigger);
  
  
      // the magic helper function...
      function getScrollPosition(animation, progress) {
        let p = gsap.utils.clamp(0, 1, progress || 0),
            st = animation.scrollTrigger,
            containerAnimation = st.vars.containerAnimation;
      
        if (containerAnimation) {  
          let time = st.start + (st.end - st.start) * p;
          st = containerAnimation.scrollTrigger;
          return st.start + (st.end - st.start) * (time / containerAnimation.duration());
        }
        return st.start + (st.end - st.start) * p;
      }
      
      
      gsap.set(".panel", { zIndex: (i, target, targets) => 1 + targets.length - i });
      gsap.set(".panel2", { zIndex: (i, target, targets) => 1 + targets.length - i });
      gsap.set(".panel3", { zIndex: (i, target, targets) => 1 + targets.length - i });
      gsap.set(".panel4", { zIndex: (i, target, targets) => 1 + targets.length - i });
      gsap.set(".panel5", { zIndex: (i, target, targets) => 1 + targets.length - i });
      gsap.set(".panel6", { zIndex: (i, target, targets) => 1 + targets.length - i });
      
      // gsap.set(".panel-text", { zIndex: (i, target, targets) => targets.length - i });
      
      var images = gsap.utils.toArray('.panel:not(.purple)');
      
      ScrollTrigger.create({
      
        trigger: "section.black",
        // pin: false,
        start: () => "top top",
        end: () => "+=" + ((images.length) * window.innerHeight),
        invalidateOnRefresh: true,
      
      });
      
      images.forEach((image, i) => {
      
        var tl = gsap.timeline({
      
          scrollTrigger: {
            trigger: ".trigger-wrap",
            // start: () => "top -" + (window.innerHeight * (i + 0.5)),     
            start: () => "top -" + (window.innerHeight * i),     
            end: () => "+=" + window.innerHeight,
            scrub: true,
            invalidateOnRefresh: true,     
          }
      
        })
      
        tl
          .fromTo(image, { height: () => { return "100%" } }, { height: () => { return "0%" } })
        ;
        
        
        i === 0 && document.querySelector('button.capsule-button.first').addEventListener('click', autoScrollHere1)
        
        function autoScrollHere1() {
            gsap.to(window, {scrollTo: getScrollPosition(tl)});
        }
        
        i === 1 && document.querySelector('button.capsule-button.second').addEventListener('click', autoScrollHere2)
        
        function autoScrollHere2() {
            gsap.to(window, {scrollTo: getScrollPosition(tl)});
        }
        
        i === 2 && document.querySelector('button.capsule-button.third').addEventListener('click', autoScrollHere3)
        
        function autoScrollHere3() {  
            gsap.to(window, {scrollTo: getScrollPosition(tl, 0)});
        }
        
        i === 2 && document.querySelector('button.capsule-button.fourth').addEventListener('click', autoScrollHere4)
        
        function autoScrollHere4() {
            gsap.to(window, {scrollTo: getScrollPosition(tl, 0.999)});
        }
      
      });
      
      
      var images2 = gsap.utils.toArray('.panel2:not(.purple)');
      images2.forEach((image, i) => {
      
        var tl = gsap.timeline({
      
          scrollTrigger: {
            trigger: ".trigger-wrap",
            // start: () => "top -" + (window.innerHeight * (i + 0.5)), 
            start: () => "top -" + (window.innerHeight * i),
            end: () => "+=" + window.innerHeight,
            scrub: true,
            invalidateOnRefresh: true,     
          }
      
        })
      
        tl
          .fromTo(image, { height: () => { return "100%" } }, { height: () => { return "0%" } })
        ;
      
      });

      var images3 = gsap.utils.toArray('.panel3:not(.purple)');
      images3.forEach((image, i) => {
      
        var tl = gsap.timeline({
      
          scrollTrigger: {
            trigger: ".trigger-wrap",
            // start: () => "top -" + (window.innerHeight * (i + 0.5)), 
            start: () => "top -" + (window.innerHeight * i),
            end: () => "+=" + window.innerHeight,
            scrub: true,
            invalidateOnRefresh: true,     
          }
      
        })
      
        tl
          .fromTo(image, { height: () => { return "100%" } }, { height: () => { return "0%" } })
        ;
      
      });

      var images4 = gsap.utils.toArray('.panel4:not(.purple)');
      images4.forEach((image, i) => {
      
        var tl = gsap.timeline({
      
          scrollTrigger: {
            trigger: ".trigger-wrap",
            // start: () => "top -" + (window.innerHeight * (i + 0.5)), 
            start: () => "top -" + (window.innerHeight * i),
            end: () => "+=" + window.innerHeight,
            scrub: true,
            invalidateOnRefresh: true,     
          }
      
        })
      
        tl
          .fromTo(image, { height: () => { return "100%" } }, { height: () => { return "0%" } })
        ;
      
      });

      var images5 = gsap.utils.toArray('.panel5:not(.purple)');
      
      images5.forEach((image, i) => {
      
        var tl = gsap.timeline({
      
          scrollTrigger: {
            trigger: ".trigger-wrap",
            // start: () => "top -" + (window.innerHeight * (i + 0.5)), 
            start: () => "top -" + (window.innerHeight * i),
            end: () => "+=" + window.innerHeight,
            scrub: true,
            invalidateOnRefresh: true,     
          }
      
        })
      
        tl
          .fromTo(image, { height: () => { return "100%" } }, { height: () => { return "0%" } })
        ;
      
      });

      var images6 = gsap.utils.toArray('.panel6:not(.purple)');
      
      images6.forEach((image, i) => {
      
        var tl = gsap.timeline({
      
          scrollTrigger: {
            trigger: ".trigger-wrap",
            // start: () => "top -" + (window.innerHeight * (i + 0.5)), 
            start: () => "top -" + (window.innerHeight * i),
            end: () => "+=" + window.innerHeight,
            scrub: true,
            invalidateOnRefresh: true,     
          }
      
        })
      
        tl
          .fromTo(image, { height: () => { return "100%" } }, { height: () => { return "0%" } })
        ;
      
      });
      
    };
  }
)

$(document).ready(
    function() {
        if ($(".black")[0]) {
          gsap.registerPlugin(ScrollTrigger);
  
          var tl3 = gsap.timeline({
              scrollTrigger: {
                  trigger: ".footer",
                  start: "top bottom",
                  end: "bottom bottom",
                  toggleActions: 'play none none reset',
                  markers: true,
              }
          })
  
          tl3.to('.black', {position:'absolute', bottom: 0})

          var progresstimeline1 = gsap.timeline({
              scrollTrigger: { 
              id: "box",
              trigger: ".panel-text2",
              scrub: true,
              start: "top bottom",
              end: "bottom bottom",
              toggleActions: 'play none none reset',
              markers: true,
              }
          }) 
          
          progresstimeline1
          .to('.capsule-button-border', { x: 33})
          ;

          var progresstimeline2 = gsap.timeline({
              scrollTrigger: { 
              id: "box",
              trigger: ".panel-text3",
              scrub: true,
              start: "top bottom",
              end: "bottom bottom",
              markers: true,
              }
          }) 
          
          progresstimeline2
          .to('.capsule-button-border', { x: 66})
          ;

          var progresstimeline3 = gsap.timeline({
              scrollTrigger: { 
              id: "box",
              trigger: ".panel-text4",
              scrub: true,
              start: "top bottom",
              end: "bottom bottom",
              markers: true,
              }
          }) 
          
          progresstimeline3
          .to('.capsule-button-border', { x: 99})
          ;
        }
    }
);
!
999px

Console