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CSS

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HTML 

              
                
<div class="smooth-scroll" id="scroll">
  

<div class="slider-years parallax--horizontal">
  
  <div class="slider-years--img">
    <img class="first-img" style="z-index: 1;" src="https://dummyimage.com/600x600/f08e29/ffffff.png&text=C" alt="" />
    <img style="z-index: 2;" src="https://dummyimage.com/600x600/32c4e4/ffffff.png&text=D" alt="" />
    <img style="z-index: 3;" src="https://dummyimage.com/600x600/f08e29/ffffff.png&text=C" alt="" />
    <img style="z-index: 4;" src="https://dummyimage.com/600x600/32c4e4/ffffff.png&text=D" alt="" />
  </div>
  
  <div class="slider-years-text">
    <div class="panel">
      <a data-video="" class="first-panel"> <span class="bigTitle">1990</span> <span class="littleIntrduction">Il Mondo nuovo</span></a>
    </div>
    <div class="panel">
      <a data-video=""> <span class="bigTitle">1991</span> <span class="littleIntrduction">Il Mondo nuovo</span></a>
    </div>
    <div class="panel">
      <a data-video=""> <span class="bigTitle">1992</span> <span class="littleIntrduction">Il Mondo nuovo</span></a>
    </div>
    <div class="panel">
      <a data-video=""> <span class="bigTitle">1993</span> <span class="littleIntrduction">Il Mondo nuovo</span></a>
    </div>
  </div>
  
</div>
</div>
!

CSS 

              
                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;
}

.c-scrollbar {
  position: absolute;
  right: 0;
  top: 0;
  width: 11px;
  height: 100vh;
  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;
}

.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;
}

.parallax--horizontal {
  width: 100%;
  height: 100vh !important;
  display: flex;
  flex-wrap: nowrap;
  background-color: #1c2157;
  overflow: hidden;
  height: auto;
  width: 100%;
  position: relative;
  padding: 0;
  overflow-x: hidden;
}
.parallax-panel {
  display: flex;
  flex: 0 0 75%;
  flex-wrap: wrap;
  align-items: center;
  align-content: center;
  justify-content: center;
  height: 100%;
  padding: 10rem 0rem 2rem 0rem;
  background-color: transparent;
  overflow: hidden;
}
.parallax--horizontal .parallax-panel {
  will-change: transform;
}

.slider-years-text {
  position: absolute;
  top: 22%;
  display: flex;
  padding-left: 20vw;
  z-index: 9999;
  a {
    display: flex;
    flex: 0 0 50%;
    flex-wrap: wrap;
    align-items: center;
    align-content: center;
    justify-content: center;
    height: 100%;
    padding: 10rem 0rem 2rem 0rem;
    background-color: transparent;
    overflow: hidden;
    flex-direction: column;
    .bigTitle {
      /* Heading */

      font-family: Helvetica Now Display;
      font-style: normal;
      font-weight: 500;
      font-size: 220px;
      line-height: 130px;
      /* or 59% */
      display: flex;
      align-items: center;
      text-align: center;

      color: #ffffff;
    }
    .littleIntrduction {
      /* Subheading */

      font-family: Helvetica Now Display;
      font-style: normal;
      font-weight: 500;
      font-size: 36px;
      line-height: 53px;
      display: flex;
      align-items: center;
      text-align: center;

      color: #ffffff;
    }
  }
}

.slider-years--img {
  img {
    position: absolute;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    opacity: 0;
  }
}

.first-img {
  opacity: 1 !important;
}

.section {
  height: 100vh;
  &--large {
    width: 100vw;
    background-color: #e4002b;
    color: white;
  }

  &--small {
    width: 46rem;
  }

  &--dark {
    color: white;
    background-color: black;
  }
}

button {
  background-color: red;

  &.enable {
    background-color: green;
  }
}

.panel {
  width: 50vw;
}





body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}

/*
.panel a {
  background-color: tomato
}

a.enable .bigTitle {
  color: green
}
*/

.smooth-scroll {
  overflow-y: hidden !important;
}

.panel a.first-panel {
  opacity: 1 !important;
}

.slider-years--img {
  opacity: 0.5
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger);
document.addEventListener("DOMContentLoaded", function() {

  var locoScroll = new LocomotiveScroll({
    el: document.querySelector("#scroll"),
    smooth: true,
    getDirection: true
  });

  const menuEl = document.querySelector("#scroll");

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

  ScrollTrigger.scrollerProxy("#scroll", {
    scrollTop(value) {
      return arguments.length ? locoScroll.scrollTo(value, 0, 0) : locoScroll.scroll.instance.scroll.y;
    }, 
    getBoundingClientRect() {
      return { top: 0, left: 0, width: window.innerWidth, height: window.innerHeight };
    },
    pinType: document.querySelector("#scroll").style.transform ? "transform" : "fixed"
  });



 

  let container = document.querySelector(".parallax--horizontal");
  
  let tl = gsap.timeline({
    scrollTrigger: {
      pin: true,
      scrub: 1,
      scroller: menuEl,
      trigger: container,
      end: () => container.scrollWidth - document.documentElement.clientWidth + container.offsetWidth
    },
    defaults: { ease: "none", duration: 1 }
  });

  tl
    .to(".slider-years-text", { x: () => -( container.scrollWidth - document.documentElement.clientWidth + 600 ) }, 0 )    
    .from(".slider-years-text a", { opacity: 0.4, duration: 0.1, stagger: { amount: 1.0 } }, 0 )
    .to(".slider-years--img img", { opacity: 1, duration: 0.1, stagger: { amount: 1.0 } }, 0 )
  ;
 

  // const buttons = document.querySelectorAll(".panel a");
  
  // buttons.forEach((btn, index) => {
  //   
  //   gsap.to(btn, {
  //     scrollTrigger: {
  //       id: `btn--round-${index}`,
  //       trigger: btn,
  //       toggleClass: "enable",
  //       markers: true,
  //       
  //       scroller: menuEl,
  //       refreshPriority: -1,
  //       start: "0 80%-=" + (btn.offsetLeft),
  //       end: "0 20%-=" + (btn.offsetLeft)
  //     }
  //   });
  //   
  // });
  
  

  // 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

Console