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HTML 

              
                <div id="hero">
  <h1>The Hero Section</h1>
  <p>Nullam gravida lacus quis elit interdum, ut dapibus lorem pulvinar. Nam mattis finibus lectus, id vulputate libero convallis vitae. Nulla ac suscipit libero. Quisque tristique dapibus augue, vel gravida neque aliquam ac. Nullam interdum egestas mauris nec tempus. Donec rhoncus, neque in viverra ullamcorper, augue nisi venenatis lorem, et scelerisque turpis diam et augue. Proin elementum blandit ligula vel fringilla.</p>
</div>

<div class="phone-container">
  <div id="phoneBorder"></div>
</div>
<div id="sectionTwo">
  <img class="respImg" src="https://images.unsplash.com/photo-1587365001066-8263b7061a38?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2970&q=80" alt="">
</div>

<div id="animationContainer">

  <div class="info info1">
    <h2>A Short Title #1</h2>
    <img class="info-img" src="https://images.unsplash.com/photo-1548689572-a7eacaf43534?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=870&q=80" alt="">
    <ul>
      <li>List item number one.</li>
      <li>List item number two.</li>
      <li>List item number three.</li>
    </ul>
  </div>
  <div class="info info2">
    <h2>A Short Title #2</h2>
    <img class="info-img" src="https://images.unsplash.com/photo-1568682057239-760834b6ce63?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=774&q=80" alt="">
    <ul>
      <li>List item number one.</li>
      <li>List item number two.</li>
      <li>List item number three.</li>
    </ul>
  </div>
  <div class="info info3">
    <h2>A Short Title #3</h2>
    <img class="info-img" src="https://images.unsplash.com/photo-1583132169905-e2a585dbbb18?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=870&q=80" alt="">
    <ul>
      <li>List item number one.</li>
      <li>List item number two.</li>
      <li>List item number three.</li>
    </ul>
  </div>
</div><!-- /#animationContainer -->

<div id="footer">
  <h2>This is the footer section.</h2>
  <p>Our animation should not scroll into this area.</p>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.phone-container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 100;
}

.respImg {
  width: 100%;
  height: auto;
}

#hero {
  color: white;
  background: #0f1010;
  text-align: center;
  padding: 8rem 5rem;
}

#sectionTwo {
  position: relative;
}

#animationContainer {
  position: relative;
  min-height: 100vh;
}

#phoneBorder {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  border: 8px solid blue;
  height: 300px;
  width: 175px;
  opacity: 0;
  visibility: hidden;
}

.info {
  position: relative; // prog enhancement
  min-height: 100vh;
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  width: 100%;
  border: 2px dotted green;

  h2 {
    width: 25%;
  }

  .info-img {
    width: 175px;
    height: 300px;
    margin: 0 1rem;
  }

  ul {
    width: 25%;
    padding: 0;
    list-style-position: inside;
  }
}

.info1 {
  z-index: 1;
}
.info2 {
  z-index: 2;
}
.info3 {
  z-index: 3;
}

.info:nth-child(n + 2) {
  opacity: 0;
}

#footer {
  color: white;
  background-color: #0f1010;
  text-align: center;
  padding: 6rem 0;
}
!

JS 

              
                console.clear();

gsap.registerPlugin(ScrollTrigger);

let phoneBorder = document.getElementById("phoneBorder");
let infos = gsap.utils.toArray(".info");
const hero = document.getElementById("hero");

gsap.set(infos, { position: "absolute" });

let tl = gsap.timeline({
  scrollTrigger: {
    trigger: "#animationContainer",
    pin: true,
    scrub: 0.5,
    start: "top top",
    end: "+=2000"
    //end: "bottom top"
  }
});

infos.forEach((info) => {
  tl.to(info, {
    opacity: 1,
    duration: 0.25
  });
  tl.to(info, {
    opacity: 0,
    duration: 0.1
  });
});
gsap.set(phoneBorder, {
  y: () => window.innerHeight,
  yPercent: -100,
});
gsap.to(phoneBorder, {
  yPercent: -50,
  autoAlpha: 1,
  scrollTrigger: {
    trigger: ".phone-container",
    pin: ".phone-container",
    pinSpacing: false,
    start: () => "top+=" + hero.clientHeight + " top",
    end: () => tl.scrollTrigger.end,
    markers: true
  }
});
!
999px

Console