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HTML

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CSS

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="spacer"></div>

<div class="side-scrolling-wrapper">

  <div class="side-scrolling-title">
    <div class="row center-xs">
          <div class="col-xs-12">
            <h1 class="fadeInUp">A cool title</h1>
          </div>
        </div>
  </div>

  <div class="container">
    <section class="panel">
      <div class="row">
        <div class="col-xs-12">
          <div class="margin-75px"></div>
          <div class="row">
            <div class="col-xs-6">
              <img src="https://dummyimage.com/600x600/f1f1f1/454545.png&text=A" alt="">
            </div>

            <div class="col-xs-6">
              <p class="step-number">Item A</p>
              <p class="step-description">
                Austin fixie banh mi hell of yr sustainable taxidermy fashion axe man braid. Art party sustainable prism synth.
              </p>
            </div>
          </div>
        </div>
      </div>
    </section>

    <section class="panel">
      <div class="row">
        <div class="col-xs-12">
          <div class="margin-75px"></div>
          <div class="row">
            <div class="col-xs-6">
              <img src="https://dummyimage.com/600x600/27aa67/ffffff.png&text=B" alt="">
            </div>

            <div class="col-xs-6">
              <p class="step-number">Item B</p>
              <p class="step-description">
                Authentic ugh migas yuccie tofu tote bag. Bicycle rights vinyl mlkshk ugh single-origin coffee williamsburg vaporware paleo put a bird on it.
              </p>
            </div>
          </div>
        </div>
      </div>
    </section>

    <section class="panel">
      <div class="row">
        <div class="col-xs-12">
          <div class="margin-75px"></div>
          <div class="row">
            <div class="col-xs-6">
              <img src="https://dummyimage.com/600x600/f08e29/ffffff.png&text=C" alt="">
            </div>

            <div class="col-xs-6">
              <p class="step-number">Item C</p>
              <p class="step-description">
                Ramps fixie paleo jianbing brunch coloring book intelligentsia blue bottle fashion axe cronut hammock food truck seitan man bun.
              </p>
            </div>
          </div>
        </div>
      </div>
    </section>

    <section class="panel">
      <div class="row">
        <div class="col-xs-12">
          <div class="margin-75px"></div>
          <div class="row">
            <div class="col-xs-6">
              <img src="https://dummyimage.com/600x600/32c4e4/ffffff.png&text=D" alt="">
            </div>

            <div class="col-xs-6">
              <p class="step-number">Item D</p>
              <p class="step-description">
                Prism snackwave portland fanny pack. Blue bottle hashtag hammock man bun, tbh paleo XOXO activated charcoal celiac viral narwhal shaman portland crucifix.
              </p>
            </div>
          </div>
        </div>
      </div>
    </section>

    <section class="panel">
      <div class="row">
        <div class="col-xs-12">
          <div class="margin-75px"></div>
          <div class="row">
            <div class="col-xs-6">
              <img src="https://dummyimage.com/600x600/e031de/ffffff.png&text=E" alt="">
            </div>

            <div class="col-xs-6">
              <p class="step-number">Item D</p>
              <p class="step-description">
                Chillwave selfies bushwick, tacos chartreuse iceland synth +1 swag roof party occupy. Freegan meditation normcore, bushwick kinfolk church-key microdosing cliche lo-fi vexillologist cold-pressed hell of.
              </p>
            </div>
          </div>
        </div>
      </div>
    </section>
  </div>

</div>

<div class="spacer"></div>
!

CSS 

              
                .side-scrolling-wrapper {
  position: relative;
    width: 100%;
    height: auto;
    padding: 100px 0px 100px 0px;
    overflow: hidden;
    display: block;
}

.side-scrolling-title {
  background: #ccc;
}

.container {
  width: 500%;
  height: 70vh;
  display: flex;
  flex-wrap: nowrap;
  padding: 0px;
  overflow: hidden;
}

.panel {
  width: 100%;
  height: 100%;
  text-align: left;
  color: white;
  position: relative;
  overflow: hidden;
  
  img {
    max-width: 100%;
    height: auto;
    display: block;
  }

  p {
    font-weight: 300;
  }

  .step-number {
    font-size: 24px;
    line-height: 27px;
    color: blue;
    font-weight: 800;
  }
  
  .step-description {
    font-size: 21px;
    line-height: 30px;
    color: black;
  }
}

.spacer {
  position: relative;
  display: block;
  background: gray;
  height: 100vh;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);

let sections = gsap.utils.toArray(".container .panel");

gsap.to(sections, {
  xPercent: -100 * (sections.length - 1),
  ease: "none",
  scrollTrigger: {
    trigger: ".side-scrolling-wrapper",
    pin: true,
    start: "top +=10px",
    markers: true,
    scrub: 1,
    snap: {
      snapTo: 1 / (sections.length - 1),
      duration: {min: 0.2, max: 0.3},
      delay: 0
    },
    // Base vertical scrolling on how wide the container is so it feels more natural.
    end: () => "+=" + (document.querySelector(".container").offsetWidth / 5)
  }
});
!
999px

Console