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HTML

              
                <div class="container">
  <div class="gradient">Locomotive Scroll Gradient</div>
</div>
              
            
!

CSS

              
                html {
  --color1: transparent;
  --color2: transparent;
}
.gradient {
  height: 100vh;
  text-align: center;
  line-height: 100vh;
  font-size: 3em;
  background: linear-gradient(to bottom, var(--color1), var(--color2));
}
body, html {
  padding: 0;
  margin: 0;
}
              
            
!

JS

              
                gsap.registerPlugin(ScrollTrigger);

// Using Locomotive Scroll from Locomotive https://github.com/locomotivemtl/locomotive-scroll

const locoScroll = new LocomotiveScroll({
  el: document.querySelector(".container"),
  smooth: true
});

// tell ScrollTrigger to use these proxy methods for the ".smooth-scroll" element since Locomotive Scroll is hijacking things
ScrollTrigger.scrollerProxy(".container", {
  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};
  },
  // LocomotiveScroll handles things completely differently on mobile devices - it doesn't even transform the container at all! So to get the correct behavior and avoid jitters, we should pin things with position: fixed on mobile. We sense it by checking to see if there's a transform applied to the container (the LocomotiveScroll-controlled element).
  pinType: document.querySelector(".container").style.transform ? "transform" : "fixed"
});

// Regular ScrollTrigger stuff
gsap.to("html", {
  "--color1": "blue",
  "--color2": "red",
  scrollTrigger: {
    pin: true,
    trigger: ".gradient",
    scroller: ".container",
    end: "+=1000",
    scrub: true
  }
});


// each time Locomotive Scroll updates, tell ScrollTrigger to update too (sync positioning)
locoScroll.on("scroll", ScrollTrigger.update);

// 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