Animated Continuous Sections with GSAP Observer

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<!DOCTYPE html>
<html lang="es" >
<head>
  <meta charset="UTF-8">
  <title>Andev Web</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Montserrat:wght@700&display=swap" rel="stylesheet"><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.2/css/all.min.css'><link rel="stylesheet" href="./style.css">

</head>
<body>
<header>
</header>
<section class="first">
  <div class="outer">
    <div class="inner">
      <div class="bg one">
        <h2 class="section-heading">Scroll down</h2>
      </div>
    </div>
  </div>

</section>
<section class="second">
  <div class="outer">
    <div class="inner">
      <div class="bg">
        <h2 class="section-heading">Animated with GSAP</h2>
      </div>
    </div>
  </div>
</section>
<section class="third">
  <div class="outer">
    <div class="inner">
      <div class="bg">
        <h2 class="section-heading">GreenSock</h2>
      </div>
    </div>
  </div>
</section>
<section class="fourth">
  <div class="outer">
    <div class="inner">
      <div class="bg">
        <h2 class="section-heading">Animation platform</h2>
      </div>
    </div>
  </div>
</section>
<section class="fifth">
  <div class="outer">
    <div class="inner">
      <div class="bg">
        <h2 class="section-heading">Keep scrolling</h2>
      </div>
    </div>
  </div>
</section>
  <script src='https://assets.codepen.io/16327/gsap-latest-beta.min.js'></script>
<script src='https://assets.codepen.io/16327/Observer.min.js'></script>
<script src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/SplitText3.min.js'></script><script  src="./script.js"></script>

</body>
</html>

CSS

@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Cormorant+Garamond&display=swap");
* {
  box-sizing: border-box;
  user-select: none;
}

a {
  color: #fff;
  text-decoration: none;
}

body {
  margin: 0;
  padding: 0;
  height: 100vh;
  color: white;
  background: black;
  font-family: "Cormorant Garamond", serif;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1rem, 5vw, 5rem);
  font-weight: 400;
  text-align: center;
  letter-spacing: 0.5em;
  margin-right: -0.5em;
  color: #cccccc;
  width: 90vw;
  max-width: 1200px;
}

header {
  position: fixed;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  width: 100%;
  z-index: 3;
  height: 7em;
  font-family: "Bebas Neue", sans-serif;
  font-size: clamp(0.66rem, 2vw, 1rem);
  letter-spacing: 0.5em;
}

section {
  height: 100%;
  width: 100%;
  top: 0;
  position: fixed;
  visibility: hidden;
}
section .outer,
section .inner {
  width: 100%;
  height: 100%;
  overflow-y: hidden;
}
section .bg {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  background-size: cover;
  background-position: center;
}
section .bg h2 {
  z-index: 2;
}
section .bg .clip-text {
  overflow: hidden;
}

.first .bg {
  background-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%), url(https://images.unsplash.com/photo-1617478755490-e21232a5eeaf?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzU1NjM5NA&ixlib=rb-1.2.1&q=75&w=1920);
}

.second .bg {
  background-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%), url("https://images.unsplash.com/photo-1617128734662-66da6c1d3505?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzc3NTM3MA&ixlib=rb-1.2.1&q=75&w=1920");
}

.third .bg {
  background-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%), url(https://images.unsplash.com/photo-1617438817509-70e91ad264a5?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzU2MDk4Mg&ixlib=rb-1.2.1&q=75&w=1920);
}

.fourth .bg {
  background-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%), url(https://images.unsplash.com/photo-1617412327653-c29093585207?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNzU2MDgzMQ&ixlib=rb-1.2.1&q=75&w=1920);
}

.fifth .bg {
  background-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.3) 100%), url("https://images.unsplash.com/photo-1617141636403-f511e2d5dc17?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxODAzMjc4Mw&ixlib=rb-1.2.1&q=75w=1920");
  background-position: 50% 45%;
}

h2 * {
  will-change: transform;
}

JS

gsap.registerPlugin(Observer);

let sections = document.querySelectorAll("section"),
  images = document.querySelectorAll(".bg"),
  headings = gsap.utils.toArray(".section-heading"),
  outerWrappers = gsap.utils.toArray(".outer"),
  innerWrappers = gsap.utils.toArray(".inner"),
  splitHeadings = headings.map(heading => new SplitText(heading, { type: "chars,words,lines", linesClass: "clip-text" })),
  currentIndex = -1,
  wrap = gsap.utils.wrap(0, sections.length),
  animating;

gsap.set(outerWrappers, { yPercent: 100 });
gsap.set(innerWrappers, { yPercent: -100 });

currentIndex = index;
}

Observer.create({
  type: "wheel,touch,pointer",
  wheelSpeed: -1,
  onDown: () => !animating && gotoSection(currentIndex - 1, -1),
  onUp: () => !animating && gotoSection(currentIndex + 1, 1),
  tolerance: 10,
  preventDefault: true
});

gotoSection(0, 1);

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