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JavaScript

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HTML 

              
                
  <div id="main">

    <section>
      <div class="panel orange">
      </div>
    </section>

    <section>
      <div class="panel blue">
      </div>
    </section>
    
    <section class="container">

      <div class="panel red">
        <div class="inner"> </div>
      </div>

      <div class="panel green">
        <div class="inner"> </div>
      </div>

      <div class="panel red">
        <div class="inner"> </div>
      </div>

  </section>
    
    
  <section>
    <div class="panel orange">
    </div>
  </section>
    
  <section>
    <div class="panel blue">
    </div>
  </section>
  </div>
!

CSS 

              
                #main{
  overflow:hidden;

}

section{
	height: 100vh;
  width:100vw;
}

.container{
  position: relative;
  display:flex;
  flex-direction:row;
  width: 100vw;
  height: 100vh;
  overflow:hidden;
}

.panel{
  width: 100vw;
  height:100%;
  display: flex;
}

.inner{
 width:100vw;
 display: flex;
 justify-content: center;
}


.orange{
  background-color:#FFB433;
}
.blue{
  background-color:#8F8FB5;
}
.green{
  background-color:green;
}
.red{
   background-color:#FF4545;
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);

/*-- ScrollTrigger 1: sections scroll and snap vertically ------*/

let sections = gsap.utils.toArray('section');
let snap = value => value; // a snapping function that we'll set later in a "refresh" event listener because we need all the ScrollTrigger positions to get calculated first

// this ScrollTrigger covers the entire page and is just for snapping logic
ScrollTrigger.create({
    start: 0,
    end: "max",
    snap: {
        snapTo: (value, self) => snap(value, self.direction),
        duration: {min: 0.2, max: 0.4},
        delay: 0,
    }
});

/*---ScrollTrigger 2: horizontal scroll in section ".container" --*/

let panels = gsap.utils.toArray(".container .panel");
 
let panelTween = gsap.to(panels, {
  xPercent: -100 * (panels.length - 1),
  ease: "none",
  scrollTrigger: {
    trigger: ".container",
    start: "top top",
    end: "+=" + (innerWidth * 3),
    markers: true,
    pin: true,
    scrub: 1,
  }
});

// we create a ScrollTrigger for each section just so we can figure out where they're positioned (when their top hits the top of the viewport)
let sectionTriggers = sections.map(section => ScrollTrigger.create({
  trigger: section,
  start: "top top",
  refreshPriority: -1 // just so they get calculated last
}));

// after ScrollTrigger refreshes, we create a snap function that's directional. 
ScrollTrigger.addEventListener("refresh", () => {
  let start = panelTween.scrollTrigger.start,
      end = panelTween.scrollTrigger.end,
      each = (end - start) / (panels.length - 1), // each panel takes up a certain distance
      max = ScrollTrigger.maxScroll(window),
      sectionPositions = sectionTriggers.map(trigger => trigger.start / max); // snapping values must be in ratios (between 0 and 1)
  panels.forEach((panel, i) => sectionPositions.push((start + i * each) / max)); // add the panel positions
  snap = ScrollTrigger.snapDirectional(sectionPositions); // a snapping function that we can just feed a scroll value to and a direction and it'll spit back the closest one (ratio/progress) in that direction
});
!
999px

Console