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HTML 

              
                <div data-scroll-container class="smoothScroll">

  <div class="content-container">

    <div class="bufferzone"></div>

    <div class="part part-1">
      <div class="bg bg-1"></div>
      <div class="imger"></div>
    </div>

    <div class="part part-2">
      <div class="bg bg-2"></div>
      <div class="imger"></div>
    </div>

    <div class="part part-4">
      <div class="bg bg-4"></div>
      <div class="imger"></div>
    </div>

    <div class="part part-5">
      <div class="bg bg-5"></div>
      <div class="imger"></div>
    </div>

    <div class="part part-6">
      <div class="bg bg-6"></div>
      <div class="imger"></div>
    </div>

    <div class="part part-7">
      <div class="bg bg-7"></div>
      <div class="imger"></div>
    </div>

    <div class="bufferzone"></div>

  </div>
  
</div>

<div class="center-indicator"></div>
!

CSS 

              
                html { 
  overflow: hidden; height: -webkit-fill-available; scroll-behavior: smooth; }


body { 
  background-color: #fff; margin: 0; padding: 0; transition: opacity ease-out 400ms; font-family: sans-serif; }

html, body{ 
  min-height: 100vh; }

.bufferzone {
  height:100vh;
    width:100vw;
}

.smoothScroll {
  background: orange
}

.content-container{
  display: flex;
  flex-direction: row;
  position: relative;
  width: auto;
  height: auto;
}

.part{
  display: flex;
  width: auto;
  height: 100vh;
  justify-content: center;
  align-items: center;
}

.bg{
  position: absolute;
  
  //width: 150vw; 
  width: 250vw; 
  height: 100vh;
  
  //transform: translate(150vw);
}

.bg-1 {
background: rgb(255,255,255);
background: linear-gradient(90deg, rgba(0,0,0,0) 0%, blue 15%, blue 85%, rgba(0,0,0,0) 100%);
    justify-content: center;
    align-items: center;
  }
  .bg-2{
background: rgb(255,255,255);
background: linear-gradient(90deg, rgba(0,0,0,0) 0%, rgba(236,244,12,1) 15%, rgba(236,244,12,1) 85%, rgba(0,0,0,0) 100%);
    color: #83448F;
    justify-content: center;
    align-items: center;
  }

  .bg-4{
   background: linear-gradient(90deg, rgba(0,0,0,0) 0%, blue 15%, blue 85%, rgba(0,0,0,0) 100%);
    color: #F3ECCF;
    justify-content: center;
    align-items: center;
  }

  .bg-5{
background: linear-gradient(90deg, rgba(0,0,0,0) 0%, yellow 15%, yellow 85%, rgba(0,0,0,0) 100%);
    color: #F3ECCF;
    justify-content: center;
    align-items: center;
  }

  .bg-6{
background: linear-gradient(90deg, rgba(0,0,0,0) 0%, orange 15%, orange 85%, rgba(0,0,0,0) 100%);
    color: #F3ECCF;
    justify-content: center;
    align-items: center;
  }
  .bg-7{
background: linear-gradient(90deg, rgba(0,0,0,0) 0%, purple 15%, purple 85%, rgba(0,0,0,0) 100%);
    color: #F3ECCF;
    justify-content: center;
    align-items: center;
  }
.imger {
  height: 80vh;
  width: 80vh;
  background-color: red;
  z-index: 999999;
  position: relative;
  margin-right: 10px;
}






// LOCOMOTIVE CSS (WILL NOT WORK WITHOUT THIS)
/*! locomotive-scroll v4.1.0 | MIT License | https://github.com/locomotivemtl/locomotive-scroll */
html.has-scroll-smooth {
  overflow: hidden; }

html.has-scroll-dragging {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none; }

.has-scroll-smooth body {
  overflow: hidden; }

.has-scroll-smooth [data-scroll-container] {
  min-height: 100vh; }

[data-scroll-direction="horizontal"] [data-scroll-container] {
  white-space: nowrap;
  height: 100vh;
  display: inline-block;
  white-space: nowrap; }

[data-scroll-direction="horizontal"] [data-scroll-section] {
  display: inline-block;
  vertical-align: top;
  white-space: nowrap;
  height: 100%; }

.c-scrollbar {
  position: absolute;
  right: 0;
  top: 0;
  width: 11px;
  height: 100%;
  transform-origin: center right;
  transition: transform 0.3s, opacity 0.3s;
  opacity: 0; }
  .c-scrollbar:hover {
    transform: scaleX(1.45); }
  .c-scrollbar:hover, .has-scroll-scrolling .c-scrollbar, .has-scroll-dragging .c-scrollbar {
    opacity: 1; }
  [data-scroll-direction="horizontal"] .c-scrollbar {
    width: 100%;
    height: 10px;
    top: auto;
    bottom: 0;
    transform: scaleY(1); }
    [data-scroll-direction="horizontal"] .c-scrollbar:hover {
      transform: scaleY(1.3); }

.c-scrollbar_thumb {
  position: absolute;
  top: 0;
  right: 0;
  background-color: black;
  opacity: 0.5;
  width: 7px;
  border-radius: 10px;
  margin: 2px;
  cursor: -webkit-grab;
  cursor: grab; }
  .has-scroll-dragging .c-scrollbar_thumb {
    cursor: -webkit-grabbing;
    cursor: grabbing; }
  [data-scroll-direction="horizontal"] .c-scrollbar_thumb {
    right: auto;
    bottom: 0; }


.center-indicator {
  position: absolute;
  width: 2px;
  height: 100%;
  background: green;
  left: calc(50vw - 1px);
  top: 0;
  z-index: 999;
}
!

JS 

              
                

window.addEventListener( 'load', (event) => {

  let locoScrollDefaults = {
    el: document.querySelector('.smoothScroll'),
    smooth: true,
    direction: "horizontal",
  };
  let locoScroll = new LocomotiveScroll(locoScrollDefaults);


  // GSAP integration
  gsap.registerPlugin(ScrollTrigger);

  locoScroll.on("scroll", ScrollTrigger.update);

  ScrollTrigger.scrollerProxy(".smoothScroll", {
    scrollTop(value) {
      return arguments.length ? locoScroll.scrollTo(value, 0, 0) : locoScroll.scroll.instance.scroll.y;
    },
    scrollLeft(value) {
      return arguments.length ? locoScroll.scrollTo(value, 0, 0) : locoScroll.scroll.instance.scroll.x;
    },
    getBoundingClientRect() {
      return {top: 0, left: 0, width: window.innerWidth, height: window.innerHeight};
    },
  });

  const projectTriggers = document.querySelectorAll(".part");

  projectTriggers.forEach(addTimeline);

  function addTimeline(project, index) {
    const bg = project.querySelector(".bg");

    const timeline = gsap.timeline({
      scrollTrigger: {
        trigger: project,
        scrub: 1,
        scroller: '.smoothScroll',
        //start: "left 70%",
        //end: "right 30%",
        start: () => 'left center+=' + window.innerHeight*0.4,
        end: () => 'right center-=' + window.innerHeight*0.4,
        invalidateOnRefresh: true,
        horizontal: true,
        //markers: true,
        snap: [0.5]
      }
    })
    .fromTo(bg, {
      x: '150vw',
      //x: () => { return (window.innerWidth*1.5) },
    },{
      x: '-150vw',
      //x: () => { return -(window.innerWidth*1.5) },
      ease:'none'
    })
    }

  
  // each time the window updates, we should refresh ScrollTrigger and then update LocomotiveScroll. 
  ScrollTrigger.addEventListener("refresh", () => locoScroll.update());

  // after everything is set up, refresh() ScrollTrigger and update LocomotiveScroll because padding may have been added for pinning, etc.
  ScrollTrigger.refresh();
    
});
!
999px

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