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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 Panels Container Animation</h1>
    <p class="text-lg font-medium">Scroll down to see a horizontal panels animation using Container Animation</p>
  </div>
</div>
<div class="w-full h-screen overflow-hidden" id="slidesWrapper">
  <div class="slides-container flex flex-nowrap w-[400%]">
    <div class="slide w-full h-screen bg-gray-200 flex justify-center items-center">
      <div class="w-4/5">
        <div class="w-full p-6">
          <h2 class="text-3xl text-center font-semibold text-gray-800 mb-6">Keep scrolling to see the container animation of the panels to the right.</h2>
        </div>
      </div>
    </div>
    <div class="slide w-full h-screen bg-gray-200 flex justify-center items-center">
      <div class="card-container border w-4/5">
        <div class="card w-full border bg-white rounded-lg p-6">
          <h2 class="text-3xl font-semibold text-gray-800 mb-6">Panel One</h2>
          <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Repudiandae, tempora! Laudantium repudiandae cum sed laborum repellendus dolore sint veniam sit quasi, nemo itaque mollitia magnam quas doloremque? Sit, ex voluptate.</p>
        </div>
      </div>
    </div>
    <div class="slide w-full h-screen bg-gray-200 flex justify-center items-center" id="longPing">
      <div class="card-container border w-4/5">
        <div class="card w-full border bg-white rounded-lg p-6">
          <h2 class="text-3xl font-semibold text-gray-800 mb-6">Panel Two</h2>
          <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Repudiandae, tempora! Laudantium repudiandae cum sed laborum repellendus dolore sint veniam sit quasi, nemo itaque mollitia magnam quas doloremque? Sit, ex voluptate.</p>
        </div>
      </div>
    </div>
    <div class="slide w-full h-screen bg-gray-200 flex justify-center items-center">
      <div class="card-container border w-4/5">
        <div class="card w-full border bg-white rounded-lg p-6">
          <h2 class="text-3xl font-semibold text-gray-800 mb-6">Panel Three</h2>
          <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Repudiandae, tempora! Laudantium repudiandae cum sed laborum repellendus dolore sint veniam sit quasi, nemo itaque mollitia magnam quas doloremque? Sit, ex voluptate.</p>
        </div>
      </div>
    </div>
  </div>
</div>
<section class="w-full h-screen bg-gray-800 text-white px-4 py-2">FINAL SECTION</section>
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CSS
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JS 

              
                gsap.registerPlugin(ScrollTrigger);
const slides = gsap.utils.toArray(".slide");
const t = gsap
  .timeline({
    scrollTrigger: {
      trigger: "#slidesWrapper",
      start: "top top",
      end: "+=2000",
      pin: true,
      scrub: true,
      snap: 1 / (slides.length - 1),
      markers: true
    }
  })
  .to(slides, {
    xPercent: -(100 * (slides.length - 1)),
    ease: "none"
  });

const cardContainers = gsap.utils.toArray(".card-container");
const cards = gsap.utils.toArray(".card");
cards.forEach((card, index) => {
  gsap.from(card, {
    opacity: 0.2,
    scale: 0.5,
    transformOrigin: "center center",
    ease: "none",
    scrollTrigger: {
      trigger: cardContainers[index],
      containerAnimation: t,
      start: "left 75%",
      end: "left 25%",
      markers: { startColor: "fuchsia", endColor: "fuchsia" },
      scrub: true
    }
  });
});
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999px

Console