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CSS

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HTML 

              
                    <main id="main">

        <header>
            <h1><span>Banner</span></h1>
        </header>


        <div id="section-timeline" class="section-timeline">
          <div class="timeline-container">
            		<article class="year year-1" data-count="1">
            		<hgroup>
            		<h2>1935</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
            		</hgroup>
            	</article>
            		<article class="year year-2" data-count="2">
            		<hgroup>
            		<h2>1949</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
            		</hgroup>
            	</article>
            		<article class="year year-3" data-count="3">
            		<hgroup>
            		<h2>1950</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text</p>
            		</hgroup>
            	</article>
            		<article class="year year-4" data-count="4">
            		<hgroup>
            		<h2>1965</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text</p>
            		</hgroup>
            	</article>
            		<article class="year year-5" data-count="5">
            		<hgroup>
            		<h2>1983</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text</p>
            		</hgroup>
            	</article>
            		<article class="year year-6" data-count="6">
            		<hgroup>
            		<h2>1989</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
            		</hgroup>
            	</article>
            		<article class="year year-7" data-count="7">
            		<hgroup>
            		<h2>1999</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text</p>
            		</hgroup>
            	</article>
            		<article class="year year-8" data-count="8">
            		<hgroup>
            		<h2>2001</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text</p>
            		</hgroup>
            	</article>
            		<article class="year year-9" data-count="9">
            		<hgroup>
            		<h2>2002</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text</p>
            		</hgroup>
            	</article>
            		<article class="year year-10" data-count="10">
            		<hgroup>
            		<h2>2003</h2>
            		<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy texts.</p>
            		</hgroup>
            	</article>


              <article class="year year-11" data-count="11">
              <hgroup>
              <h2>2004</h2>
              <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
              </hgroup>
            </article>
            <article class="year year-12" data-count="12">
            <hgroup>
            <h2>2005</h2>
            <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
            </hgroup>
          </article>
          <article class="year year-13" data-count="13">
          <hgroup>
          <h2>2006</h2>
          <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
          </hgroup>
        </article>
        <article class="year year-14" data-count="14">
        <hgroup>
        <h2>2007</h2>
        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
        </hgroup>
      </article>
      <article class="year year-15" data-count="15">
      <hgroup>
      <h2>2008</h2>
      <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text.</p>
      </hgroup>
    </article>
          </div>
        </div>


    </main> <!-- #main-container -->
    <div class="footer">
    <h1>footer</h1>
    </div>
!

CSS 

              
                :root {
  --text-color: white;
  --text-dark-color: #202020;
  --header-height: 100px;
  --burger-width: 40px;
  --font-headings: Georgia, serif;
  --blue: #758A94;
  --bluedark: #566C76;
  --v-spacing: 10vh;
  --h-gutter: 6.6vw;
  --easing: cubic-bezier(0.5, 0.7, 0.4, 1);
}

body {
  font: 16px/1.7 'Source Sans Pro', Helvetica, Helvetica Neue, Arial, sans-serif;
  color: var(--text-dark-color);
  background-color: var(--blue);
}

header {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  flex-direction: column;
  z-index: 2;
}

header h1 {
  font-family: var(--font-headings);
  font-weight: normal;
  color: #fff;
  font-size: 7vw;
  line-height: 7.4vw;
  z-index: 1;
  margin-bottom: 0;
  pointer-events: none;
}

/* =Main */
main {
  z-index: 1;
  position: relative;

}
.footer{
  height: 700px;
  position: relative;
  z-index: 9999;
  background: red;
}

.footer h1{
  margin: 0;
}
/*section {
  position: relative;
}*/
.section-timeline {
  position: relative;
  top: 0;
  left: 0;
  width: 100vw;
  overflow: hidden;
  height: 100vh;
  background: #232323;

}
.test{
  padding-top: 200px;
}
.timeline-container {
  height: 100vh;
  width: 100%;
  position: absolute;
  transition: 0.6s cubic-bezier(0.28, 0, 0.18, 1);
  padding-top: 100px;

  padding-bottom: 100px;

}
.timeline-container article {
  position: relative;
    z-index: 1000;
    color: white;
    text-align: center;

    display: flex;
flex-direction: row ;
flex-wrap: nowrap ;
justify-content: center;
align-items: center;
align-content: center;

}
.timeline-container  article.year hgroup{
/*  position: absolute;
    top: 50%;
    width: 90%;
    left: 50%;
        transform: translateY(-50%) translateX(-50%);*/
}
.timeline-container article.year {
  transition: 0.6s cubic-bezier(0.28, 0, 0.18, 1) 0.3s;
  height: 100vh;
  max-height: 3rem;
  position: relative;
  color: white;
  text-align: center;
}

.timeline-container article.year hgroup h2 {
  transition: 0.6s cubic-bezier(0.28, 0, 0.18, 1);
  font-size: 2rem;
  line-height: 1;
  margin: 0;
}

.timeline-container article.year hgroup p {
  line-height: 1.5;
  font-size: 1.25rem;
  opacity: 0 !important;
  max-height: 0px;
  max-width: 600px;
  margin: 0 auto;
  transition: opacity 0.6s cubic-bezier(0.28, 0, 0.18, 1);
}

/*ACTIVE*/
#section-timeline article.year.active {
  max-height: 80vh;
}
/*#section-timeline article.year:after{
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  width: 4px;
  background: #ffffff;
  height: 120px;
  margin-top: -60px;
  max-height: 0px;
      transform: translateX(-50%) translateY(-100%);
      transition: 0.3s cubic-bezier(0.28, 0, 0.18, 1);

}*/
#section-timeline article.year hgroup:after{
  content: '';
  position: absolute;
  /*top: 100%;*/
  top: 90%;
  left: 50%;
  width: 4px;
  background: #ffffff;
  height: 120px;

  max-height: 0px;
      transform: translateX(-50%) translateY(-100%);
      transition: 0.3s cubic-bezier(0.28, 0, 0.18, 1);

}
#section-timeline article.year.active hgroup:after{
  transition: 0.6s cubic-bezier(0.28, 0, 0.18, 1) 0.6s;
  max-height: 90px;
}
/*#section-timeline article.year.active:after{
  transition: 0.6s cubic-bezier(0.28, 0, 0.18, 1) 0.6s;
  max-height: 90px;
}*/
#section-timeline.started .year.active h2 {
  transition: 0.6s cubic-bezier(0.28, 0, 0.18, 1) 0.6s;
}
#section-timeline.started .year.active p{
  transition: opacity 0.6s cubic-bezier(0.28, 0, 0.18, 1) 1s;
}

.timeline-container article.year.active hgroup h2 {
  font-size: 10rem;
}

.timeline-container  article.year.active hgroup p {
  opacity: 1 !important;
      max-height: 100%;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);

 function initTimeline(){

   let parent_container = document.getElementById("section-timeline");
   let timeline_container = parent_container.querySelector(".timeline-container");
   var sections = timeline_container.querySelectorAll(".year");

  const vh = (coef) => window.innerHeight * (coef/100);



     ScrollTrigger.create({
       id: "parent-timeline",
       trigger: parent_container,
       start:'top top',
       toggleClass: 'started',
       pin:true,
       markers: true,
      end: () => "+=" + ((sections.length - 1) * vh(80)),
     });


     sections.forEach((sct, i) => {

       let startPosition = () => `top+=${vh(20) * (i)} top`;
       let endPosition = () => `bottom+=${vh(20) * (i+1)} top`;
       if(i === 0){
         startPosition = 'top top';
         endPosition = () => `bottom+=${vh(20)} top`;
       }

       ScrollTrigger.create({
         id: 'section',
         trigger: sct,
         start: startPosition,
         end: endPosition,
         scrub: 1,
         toggleClass: 'active',
         markers: true,
         onEnter: () => {
           var sct_index = sct.getAttribute('data-count');
           var shift_value = 48;

           var tl_container_shift_up = (shift_value * sct_index) * -1;

           timeline_container.style.marginTop = tl_container_shift_up+"px";
         },
         onLeaveBack: () => {
           var spin = sct.getAttribute('data-count');
           var current_marginTop = parseInt(timeline_container.style.marginTop);
           var new_margin_value = current_marginTop + 48;
           timeline_container.style.marginTop = new_margin_value +"px";

         },
       })

     });

     }

initTimeline();

// function init(){
//     initTimeline();
// }
// // window.addEventListener('resize', function(){
// //     init();
// // });

// window.addEventListener('load', function(){
//     init();
// });
!
999px

Console