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About the <head>

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CSS

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HTML 

              
                <div class="w-full h-screen flex justify-center">
  <div class="container mx-auto p-8 flex flex-col justify-center items-center">
    <h1 class="text-4xl text-center font-semibold mb-12">GSAP ScrollTrigger Pinned Text Sections</h1>
  </div>
</div>
<div class="vertical-section w-full h-screen overflow-hidden flex text-white text-lg bg-orange-600" id="sectionOne">
  <div class="w-full absolute inset-0 h-screen z-0 flex flex-col justify-center items-center bg-cover bg-center" style="background-image: url(https://source.unsplash.com/random/900×700&1/?forest)">
    <div class="w-full h-full bg-gray-800/50"></div>
  </div>
  <div class="w-full h-screen relative z-10">
    <div class="container absolute inset-0 mx-auto h-screen p-8 large-child">
      <p class="mb-4">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Aliquam quia nam nulla nostrum impedit, amet totam voluptatem tenetur veritatis explicabo dolore quaerat, suscipit pariatur dolorum, accusamus nihil dolores deleniti. Tempora odit, aut nostrum vel debitis iure soluta repellendus, earum consequuntur architecto incidunt cum explicabo animi modi provident fugit quidem nam.</p>
    </div>
    <div class="container absolute inset-0 mx-auto h-screen p-8 large-child">
      <p class="mb-4">Distinctio ipsa, saepe inventore assumenda nostrum maiores dolores. Dolorum nulla error, rem amet iste delectus porro laborum saepe dolore earum obcaecati esse cum possimus repellat distinctio perferendis quam ex doloribus officiis? Culpa minima animi pariatur sint, id corporis, accusantium suscipit, esse iusto eum totam nemo nihil ratione dolor vitae. Eius.</p>
    </div>
  </div>
</div>

<section class="w-full h-screen flex justify-center items-center bg-gray-800 text-white px-4 py-2">
  <h1 class="text-4xl text-center font-semibold mb-12">Some Section Between...</h1>
</section>

<div class="vertical-section w-full h-screen overflow-hidden flex text-white text-lg bg-orange-600" id="sectionTwo">
  <div class="w-full absolute inset-0 h-screen z-0 flex flex-col justify-center items-center bg-cover bg-center" style="background-image: url(https://source.unsplash.com/random/900×700&2/?forest)">
    <div class="w-full h-full bg-gray-800/50"></div>
  </div>
  
  <div class="w-full h-screen relative z-10">
    <div class="container absolute inset-0 mx-auto h-screen p-8 large-child">
      <p class="mb-4">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Aliquam quia nam nulla nostrum impedit, amet totam voluptatem tenetur veritatis explicabo dolore quaerat, suscipit pariatur dolorum, accusamus nihil dolores deleniti. Tempora odit, aut nostrum vel debitis iure soluta repellendus, earum consequuntur architecto incidunt cum explicabo animi modi provident fugit quidem nam.</p>
    </div>
    <div class="container absolute inset-0 mx-auto h-screen p-8 large-child">
      <p class="mb-4">Distinctio ipsa, saepe inventore assumenda nostrum maiores dolores. Dolorum nulla error, rem amet iste delectus porro laborum saepe dolore earum obcaecati esse cum possimus repellat distinctio perferendis quam ex doloribus officiis? Culpa minima animi pariatur sint, id corporis, accusantium suscipit, esse iusto eum totam nemo nihil ratione dolor vitae. Eius.</p>
    </div>
  </div>
</div>

<section class="w-full h-screen flex justify-center items-center bg-gray-800 text-white px-4 py-2">
  <h1 class="text-4xl text-center font-semibold mb-12">Another Section Between...</h1>
</section>

<div class="vertical-section w-full h-screen overflow-hidden flex text-white text-lg bg-orange-600" id="sectionThree">
  <div class="w-full absolute inset-0 h-screen z-0 flex flex-col justify-center items-center bg-cover bg-center" style="background-image: url(https://source.unsplash.com/random/900×700&3/?forest)">
    <div class="w-full h-full bg-gray-800/50"></div>
  </div>
  <div class="w-full h-screen relative z-10">
    <div class="container absolute inset-0 mx-auto h-screen p-8 large-child">
      <p class="mb-4">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Aliquam quia nam nulla nostrum impedit, amet totam voluptatem tenetur veritatis explicabo dolore quaerat, suscipit pariatur dolorum, accusamus nihil dolores deleniti. Tempora odit, aut nostrum vel debitis iure soluta repellendus, earum consequuntur architecto incidunt cum explicabo animi modi provident fugit quidem nam.</p>
    </div>
    <div class="container absolute inset-0 mx-auto h-screen p-8 large-child">
      <p class="mb-4">Distinctio ipsa, saepe inventore assumenda nostrum maiores dolores. Dolorum nulla error, rem amet iste delectus porro laborum saepe dolore earum obcaecati esse cum possimus repellat distinctio perferendis quam ex doloribus officiis? Culpa minima animi pariatur sint, id corporis, accusantium suscipit, esse iusto eum totam nemo nihil ratione dolor vitae. Eius.</p>
    </div>
  </div>
</div>

<section class="w-full h-screen flex justify-center items-center bg-gray-800 text-white px-4 py-2">
  <h1 class="text-4xl text-center font-semibold mb-12">Enjoy!!!</h1>
</section>

<header>
  <a href="https://greensock.com/scrolltrigger">
    <img class="greensock-icon" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/16327/scroll-trigger-logo-light.svg" width="200" height="64" />
  </a>
</header>
!

CSS 

              
                header {
  position: fixed;
  top: 0px;
  left: 0px;
  padding: 6px 10px 10px 10px;
  border-bottom-right-radius: 26px;
  z-index: 100;
  background-color: rgba(0, 0, 0, 0.5);
  will-change: transform;
}
!

JS 

              
                console.clear();

gsap.registerPlugin(ScrollTrigger);

const sections = gsap.utils.toArray(".vertical-section");
gsap.set(".large-child", {
  yPercent: 100,
});

sections.forEach((section) => {
  const large = section.querySelectorAll(".large-child");
  
  const tl = gsap.timeline({
    defaults: {
      ease: "none",
    },
    scrollTrigger: {
      trigger: section,
      pin: true,
      start: "top top",
      end: () => "+=200%",
      scrub: 0.5,
      markers: true,
      invalidateOnRefresh: true,
    }
  });
  large.forEach((section, i) => {
    const content = section.querySelector("p");
    if (i < large.length - 1) {
      tl.to(section, {
        yPercent: 0,
      }, "<")
      .to(section, {
        opacity: 0,
        y: () => -(content.clientHeight + 20),
      });
    } else {
      tl.to(section, {
        yPercent: 0,
      }, "<");
    }
  });
});
!
999px

Console