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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>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <section class="header">
  <div class="headercontainer">
    <h1>Animation on Scroll Showcase</h1>
    <div class="headertxt">
      #CodePenChallenge Scrolling Animations<br>
      It's the final week of the June #CodePenChallenge!
    </div>
  </div>
</section>
<section class="content1">
  <div id="texthighlighting" class="texthighlightbox">
    <span>Lorem</span><span>ipsum</span><span>dolor</span><span>sit</span><span>amet,</span><span>consetetur</span><span>sadipscing</span><span>elitr,</span><span>sed</span><span>diam</span><span>nonumy</span><span>eirmod</span><span>tempor</span><span>invidunt</span><span>ut</span><span>labore</span><span>et</span><span>dolore</span><span>magna</span><span>aliquyam</span><span>erat,</span><span>sed</span><span>diam</span><span>voluptua.</span><span>At</span><span>vero</span><span>eos</span><span>et</span><span>accusam</span><span>et</span><span>justo</span><span>duo</span><span>dolores</span><span>et</span><span>ea</span><span>rebum.</span><span>Stet</span><span>clita</span><span>kasd</span><span>gubergren,</span><span>no</span><span>sea</span><span>takimata</span><span>sanctus</span><span>est</span><span>Lorem</span><span>ipsum</span><span>dolor</span><span>sit</span><span>amet.</span>
  </div>
</section>
<section class="content2">
  <div class="flyintxtbox" id="flyintxt">
    <span>We</span><span>are</span><span>creative</span><span>minds,</span><span>designers,</span><span>programmers,</span><span>and</span><span>much</span><span>more.</span><span>Our</span><span>passion</span><span>drives</span><span>us</span><span>to</span><span>create</span><span>innovative</span><span>solutions</span><span>and</span><span>bring</span><span>unique</span><span>projects</span><span>to</span><span>life.</span>
  </div>
</section>
<section class="sticky-txt">
  <div class="content-left" id="left-content">
    <h2>CodePen is a site where</h2>
  </div>
  <div class="content-right">
    <div class="content-box-div-right">
      <h2>Creativity Flourishes</h2>
      <p>Developers and designers come together to experiment with code and create stunning visual effects.</p>
    </div>
    <div class="content-box-div-right">
      <h2>Learning Happens</h2>
      <p>People of all skill levels share knowledge, inspire each other, and grow their programming skills.</p>
    </div>
    <div class="content-box-div-right">
      <h2>Innovation Thrives</h2>
      <p>New ides are born, and cutting-edge web technologies are showcased and explored.</p>
    </div>
  </div>
</section>
<section class="content7">
  <svg class="svgScrollAnimation" width="300" height="350" xmlns="http://www.w3.org/2000/svg">
    <circle id="circle1" cx="50" cy="50" r="10" fill="#333" />
    <text id="text1" x="70" y="55" fill="#333">Responsive Design</text>

    <circle id="circle2" cx="50" cy="175" r="10" fill="#333" />
    <text id="text2" x="70" y="180" fill="#333">User Experience</text>

    <circle id="circle3" cx="50" cy="300" r="10" fill="#333" />
    <text id="text3" x="70" y="305" fill="#333">Visual Impact</text>

    <line id="lineDeactivated" x1="50" y1="50" x2="50" y2="300" stroke="#333" stroke-width="2" />

    <line id="lineActivated" x1="50" y1="50" x2="50" y2="50" stroke="#fff" stroke-width="2" />
  </svg>
</section>
<section class="content4">
  <div class="containerflexbox">
    <div id="flexbox1" class="flexbox">
      <h3>What are Scroll Animations?</h3>
      <p>Scroll animations are visual effects triggered as users scroll down a webpage. They enhance user experience by providing engaging and interactive elements.</p>
    </div>
    <div id="flexbox2" class="flexbox">
      <h3>How to Implement?</h3>
      <p>Use CSS properties like <code>@keyframes</code> and <code>animation</code> in combination with JavaScript libraries such as ScrollMagic or Intersection Observer API to trigger animations.</p>
    </div>
    <div id="flexbox3" class="flexbox">
      <h3>Examples & Tips</h3>
      <p>Create smooth transitions with <code>transform</code> and <code>opacity</code>. Keep animations subtle to avoid distracting users. Test across different devices for performance.</p>
    </div>
  </div>
</section>
<section class="content5">
  <div class="split-image-container" id="splitImageContainer">
    <div id="divtop">
      <div class="image1-top"><img src="https://rassweiler-it.de/images/codepen-without-css.png"></div>
      <div class="image2-top"><img src="https://rassweiler-it.de/images/codepen-with-css.png"></div>
    </div>
    <div id="divbottom">
      <div class="image2-bottom"><img src="https://rassweiler-it.de/images/codepen-with-css.png"></div>
      <div class="image1-bottom"><img src="https://rassweiler-it.de/images/codepen-without-css.png"></div>
    </div>
  </div>
</section>
<section class="content6">
  <div class="container" id="scrollContainer">
    <div class="clip-path">#CODEPEN</div>
    <div class="background-1"></div>
    <div class="background-2"></div>
  </div>
</section>
!

CSS 

              
                body {
  background: black;
  font-family: Arial, sans-serif;
  margin: 0;
  overflow-x: hidden;
}

.header {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: linear-gradient(0deg, rgba(0,0,0,1) 20%, rgba(255,255,255,0) 100%), repeating-linear-gradient(transparent, transparent 50px, #333 52px), repeating-linear-gradient(90deg, transparent, transparent 50px, #333 52px);
  background-attachment: fixed;
}

.header h1 {
  color: #fff;
  text-align: center;
  letter-spacing: -.03em;
  text-transform: uppercase;
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 46px;
  line-height: 60px;
}

.headertxt {
  max-width: 750px;
  color: #fff;
  text-align: center;
  margin: 20px auto 40px;
  font-size: 22px;
  line-height: 36px;
}

.content1 {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.texthighlightbox {
  white-space: normal;
  word-wrap: break-word;
  width: 600px;
  max-width: 100%;
  padding: 10px;
  box-sizing: border-box;
  margin: 0 auto;
}

.texthighlightbox span {
  margin: 0 3px;
  color: #333;
  text-transform: uppercase;
  display: inline-block;
  font-size: 34px;
  line-height: 50px;
  margin: 0 3px;
}

.content2 {
  color: #fff;
  white-space: normal;
  word-wrap: break-word;
  max-width: 100%;
  padding: 10px;
  box-sizing: border-box;
  margin: 200px auto;
  text-align: center;
}

.flyintxtbox span {
  transform-origin: 0 0;
  font-weight: 300;
  line-height: 1.2;
  font-size: 100px;
  display: inline-block;
  text-transform: uppercase;
  margin: 0 15px;
  transform: translateX(-20px) scale(0.75);
  transition: 0.5s;
}

.flyintxtbox span.v2 {
  font-weight: 500;
  transform: translateX(0) scale(1);
  transition: 0.5s;
}

@media only screen and (max-width: 900px) {
  .flyintxtbox span {
    font-size: 50px;
  }
}

@media only screen and (max-width: 500px) {
  .flyintxtbox span {
    font-size: 30px;
  }
}

.sticky-txt {
  display: flex;
  align-items: flex-start;
  color: #fff;
}

.content-right {
  flex: 1;
  padding: 100px;
  box-sizing: border-box;
}
.content-left {
  flex: 1;
  position: sticky;
  will-change: transform;
  text-align: center;
  box-sizing: border-box;
  margin-top: 100px;
  margin-bottom: 100px;
}

.content-box-div-right {
  border: 1px solid rgba(210, 210, 210, .2);
  border-radius: 20px;
  margin-bottom: 30px;
  padding: 40px 20px;
  transition: transform 0.3s ease;
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .sticky-txt {
    flex-direction: column;
    align-items: center;
  }
  .content-left, .content-right {
    padding: 20px;
    width: 100%;
  }
  .content-left {
    position: static;
    margin-top: 20px;
    margin-bottom: 20px;
  }
}

.content4 {
  height: auto;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  box-sizing: border-box;
}

.containerflexbox {
  width: 100%;
  height: 300px;
  position: relative;
  margin: 100px auto;
}

.containerflexbox div {
  position: absolute;
  height: 300px;
  width: 350px;
  border: 1px solid #333;
  border-radius: 15px;
  padding: 20px;
  box-sizing: border-box;
  transition: transform 0.5s;
}

#flexbox1 {left: 50px; color: #fff; transform: translateX(0) scale(0);}
#flexbox2 {left: 50%; transform: translateX(-50%) scale(0); color: #fff;}
#flexbox3 {right: 50px; color: #fff; transform: translateX(0) scale(0);}

#flexbox1.visible {transform: translateX(0) scale(1);}
#flexbox2.visible {transform: translateX(-50%) scale(1);}
#flexbox3.visible {transform: translateX(0) scale(1);}

@media (max-width: 1200px) {
  .containerflexbox div {
    width: 300px;
  }
}

@media (max-width: 1050px) {
  .containerflexbox div {
    width: 280px;
  }
}

@media (max-width: 980px) {
  .containerflexbox {
    position: static;
    height: auto;
  }
  
  .containerflexbox div {
    width: 500px;
    position: static;
    max-width: 85%;
  }

  #flexbox1 {margin: 10px auto; color: #fff; transform: translateX(0) scale(0);}
  #flexbox2 {margin: 10px auto; color: #fff; transform: translateX(0) scale(0);}
  #flexbox3 {margin: 10px auto; color: #fff; transform: translateX(0) scale(0);}
  #flexbox1.visible, #flexbox2.visible, #flexbox3.visible {transform: translateX(0) scale(1);}
}

.content5 {
  width: 100vw;
  height: 200vh;
  overflow: hidden;
  position: relative;
}

.split-image-container {
  overflow: hidden;
  width: 100vw;
  height: 100vh;
}

#divtop, #divbottom {
  width: 200vw;
  height: 50vh;
  display: flex;
}

#divtop {
  transform: translateX(0);
}

#divbottom {
  transform: translateX(-100vw);
}

.image1-top, .image2-top, .image1-bottom, .image2-bottom {
  overflow: hidden;
  width: 100vw;
  position: relative;
}

.image1-top img, .image2-top img, .image1-bottom img, .image2-bottom img {
  height: 100vh;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.image1-top img {top: 0;}
.image2-top img {top: 0;}
.image1-bottom img {bottom: 0;}
.image2-bottom img {bottom: 0;}

.content6 {
  min-height: 100vh;
  font-family: 'Impact', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  background-color: black;
  position: relative;
  height: 65px;
  width: 250px;
  margin: 0;
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
  transition: 0.3s;
  cursor: pointer;
}

.clip-path {
  position: absolute;
  top: 0;
  color: rgb(255, 255, 255, 1);
  font-size: 60px;
  height: 65px;
  line-height: 65px;
  width: 250px;
  background-color: black;
  z-index: 2;
  mix-blend-mode: multiply;
}

.background-1 {
  position: absolute;
  top: 0;
  left: 0;
  width: 250px;
  height: 65px;
  background-color: yellow;
  z-index: 1;
  transition: left 0.3s;
}

.background-2 {
  position: absolute;
  top: 0;
  left: -250px;
  width: 250px;
  height: 65px;
  background-color: aqua;
  z-index: 1;
  transition: left 0.3s;
}

/* Custom Scrollbar for Touch devices */
::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  box-shadow: none; 
  border-radius: 2.5px;
}
 
::-webkit-scrollbar-thumb {
  background: #00FFFF;
  border-radius: 0;
  cursor: pointer;
}

::-webkit-scrollbar-thumb:hover {
  background: #7CFFFF;
}

/* Custom Scrollbar for non-touch devices */
@media (hover: hover) and (pointer: fine) {
  /* Custom Scrollbar */
  ::-webkit-scrollbar {
    width: 20px;
  }

  ::-webkit-scrollbar-track {
    box-shadow: inset 0 0 5px grey; 
    border-radius: 10px;
  }
   
  ::-webkit-scrollbar-thumb {
    background: #00FFFF; 
    border-radius: 10px;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: #7CFFFF;
  }
}

.content7 {
  padding: 50px 0;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.svgScrollAnimation {
  position: relative;
  z-index: 1;
  width: 300px;
}
!

JS 

              
                function adjustStickyPosition() {
  var contentLeft = document.getElementById('left-content');
  var height = contentLeft.clientHeight;
  var topOffset = 'calc(50% - ' + (height / 2) + 'px)';
  contentLeft.style.top = topOffset;
}

window.addEventListener('scroll', function() {
  const spans = document.querySelectorAll('.texthighlightbox span');
  const windowHeight = window.innerHeight;
  const content2Spans = document.querySelectorAll('.content2 .flyintxtbox span');

  let lines = [];
  let currentLine = -1;
  let lastTop = -1;

  spans.forEach((span, index) => {
    const spanRect = span.getBoundingClientRect();
    if (spanRect.top !== lastTop) {
      currentLine++;
      lines[currentLine] = [];
      lastTop = spanRect.top;
    }
    lines[currentLine].push(span);
  });

  lines.forEach(line => {
    const firstSpan = line[0];
    const firstSpanRect = firstSpan.getBoundingClientRect();
    const firstSpanCenterY = firstSpanRect.top + (firstSpanRect.height / 2);

    line.forEach((span, index) => {
      if (firstSpanCenterY <= windowHeight / 2) {
        span.style.color = '#fff';
      } else {
        span.style.color = '#333';
      }
    });
  });

  content2Spans.forEach((span) => {
    const spanRect = span.getBoundingClientRect();
    const spanBottomY =  spanRect.bottom;

    if (spanBottomY <= windowHeight) {
      span.classList.add('v2');
    } else {
      span.classList.remove('v2');
    }
  });
});

document.addEventListener('scroll', function() {
  const container = document.getElementById('scrollContainer');
  const background1 = document.querySelector('.background-1');
  const background2 = document.querySelector('.background-2');
  const rect = container.getBoundingClientRect();
  const windowHeight = window.innerHeight;
  const middleOfViewport = windowHeight / 2;

  if (rect.top < windowHeight && rect.bottom > 0) {
    const distanceToMiddle = Math.abs(rect.top + rect.height / 2 - middleOfViewport);
    const percentageScrolled = Math.min(1, distanceToMiddle / middleOfViewport);
    if (rect.top + rect.height / 2 < middleOfViewport) {
      background1.style.left = '250px';
      background2.style.left = '0px';
    } else {
      const leftValue = 250 * (1 - percentageScrolled);
      background1.style.left = `${leftValue}px`;
      background2.style.left = `${leftValue - 250}px`;
    }
  } else {
    background1.style.left = '0px';
    background2.style.left = '-250px';
  }
});

document.addEventListener('DOMContentLoaded', function () {
  const splitImageContainer = document.getElementById('splitImageContainer');
  const content5 = document.querySelector('.content5');
  const divTop = document.getElementById('divtop');
  const divBottom = document.getElementById('divbottom');

  function onScroll() {
    const containerRect = splitImageContainer.getBoundingClientRect();
    const content4Rect = content5.getBoundingClientRect();
    const viewportHeight = window.innerHeight;

    // Calculate scroll progress
    const scrollProgress = Math.min(Math.max((window.scrollY - content5.offsetTop) / (content5.offsetHeight - viewportHeight), 0), 1);

    // Update divTop and divBottom positions based on scroll progress
    const translateTopX = -scrollProgress * 100;
    const translateBottomX = -100 + (scrollProgress * 100);

    divTop.style.transform = `translateX(${translateTopX}vw)`;
    divBottom.style.transform = `translateX(${translateBottomX}vw)`;

    if (content4Rect.top <= 0 && content4Rect.bottom >= viewportHeight) {
      splitImageContainer.style.position = 'fixed';
      splitImageContainer.style.top = '0';
    } else if (content4Rect.bottom < viewportHeight) {
      splitImageContainer.style.position = 'absolute';
      splitImageContainer.style.top = (content5.offsetHeight - splitImageContainer.offsetHeight) + 'px';
    } else if (content4Rect.top > 0) {
      splitImageContainer.style.position = 'relative';
      splitImageContainer.style.top = '0';
    }
  }

  window.addEventListener('scroll', onScroll);
  // Initial call to set the correct position
  onScroll();

  const options = {
    root: null,
    rootMargin: '0px',
    threshold: 0.1
  };

  const observer = new IntersectionObserver((entries, observer) => {
    entries.forEach(entry => {
      if (entry.isIntersecting) {
        entry.target.classList.add('visible');
      } else {
        entry.target.classList.remove('visible');
      }
    });
  }, options);

  document.querySelectorAll('.flexbox').forEach(flexbox => {
    observer.observe(flexbox);
  });

});


function initialize () {
  adjustStickyPosition ();
}

window.onload = initialize;
window.onresize = initialize;

document.addEventListener('scroll', function() {
  const screenHeight = window.innerHeight;
  const circles = document.querySelectorAll('circle');
  const texts = document.querySelectorAll('text');
  const lineActivated = document.getElementById('lineActivated');

  circles.forEach((circle, index) => {
    const circleTop = circle.getBoundingClientRect().top;
    const text = texts[index];
    if (circleTop <= screenHeight / 2) {
      circle.setAttribute('fill', '#fff');
      text.setAttribute('fill', '#fff');
    } else {
      circle.setAttribute('fill', '#333');
      text.setAttribute('fill', '#333');
    }
  });

  const circle1Top = document.getElementById('circle1').getBoundingClientRect().top;
  if (circle1Top < screenHeight / 2) {
    const position = 50 + (175 - 50) * ((screenHeight / 2 - circle1Top) / (175 - 50));
    lineActivated.setAttribute('y2', Math.min(300, Math.max(50, position)));
  } else {
    lineActivated.setAttribute('y2', 50);
  }
});
!
999px

Console