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HTML

              
                <!-- SCROLL CONTAINER -->
<div class="smooth-scroll">
  
  <div class="section-wrapper" data-scroll-section>

  <section id="section1">
    <div id="box1" data-scroll data-scroll-speed="2" data-scroll-position="top"></div>
    <div id="box2" data-scroll data-scroll-speed="5" data-scroll-position="top"></div>
    <div id="box3" data-scroll data-scroll-speed="4" data-scroll-position="top"></div>
    <div id="overlay" data-scroll data-scroll-speed="2" data-scroll-position="top"></div>
  </section>

  <section id="section2">
    <div id="box4" data-scroll data-scroll-speed="2"></div>
    <div id="box5" class="parallax" data-speed=".5"></div>
    <div id="box6" data-scroll data-scroll-speed="4"></div>
  </section>
    
   
   <section id="sectionPin">
     <div class="pin-wrap">
<!--         <div class="animation-wrap to-right" id="animateThis-0"> -->
           <div class="pin-box">pin box 1</div>
           <div class="pin-box">pin box 2</div>
           <div class="pin-box">pin box 3</div>
<!--        </div> -->
     </div>
   </section>
    
  
  <section id="section3">
  <div id="box7" class="parallax" data-speed=".2"></div>
  <div id="box8" data-scroll data-scroll-speed="1">
   <p> Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur eget laoreet magna, eu ornare lorem. Integer id commodo nunc, at maximus neque. Aliquam eu orci ac mi ornare maximus. Vestibulum ultricies sollicitudin erat, sed interdum enim eleifend sed. Mauris consequat sapien nibh, et convallis lacus eleifend ac. Curabitur ipsum nunc, placerat et mattis ut, molestie non mauris. Ut ultricies est a justo fringilla, vel ultrices mi fringilla. Maecenas vel ultricies nisl, vel feugiat est. Etiam sit amet magna id ante mollis commodo quis a ipsum.</p>

<p>Sed congue nisi dolor, quis dapibus lacus pharetra nec. Proin metus odio, dapibus sit amet erat ac, semper rutrum ipsum. Sed in lacinia eros, non ultrices mi. Cras tempus ultricies malesuada. Quisque diam mi, ornare ac odio sit amet, fermentum sagittis nibh. Donec lectus orci, suscipit a lorem nec, mollis sagittis metus. Suspendisse vel tristique lorem. Aenean enim leo, consectetur in tristique quis, tincidunt sed ex.</p>

<p>Integer et tellus at enim faucibus facilisis id ut est. Nulla facilisi. Sed orci orci, interdum at sagittis at, vehicula vel purus. Vivamus ac ante tempus, laoreet nibh at, tempus massa. Fusce sit amet dui purus. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut imperdiet velit eu libero tempor molestie.</p>

<p>Pellentesque consectetur, ligula et mollis posuere, diam ipsum maximus nisi, et fermentum elit erat id arcu. Donec non lobortis velit, eget accumsan dolor. Ut tristique dapibus mi. Donec suscipit, risus eu euismod mollis, ligula neque ultrices metus, ac fringilla est ligula sed lectus. Vivamus viverra a ante id tincidunt. Nam luctus lacus vel leo accumsan egestas. Etiam at pretium leo. Maecenas eu ultrices magna, sed pellentesque sapien. Phasellus ut purus eu massa hendrerit bibendum. Donec a eleifend urna. Curabitur pellentesque felis in mauris posuere, eget semper leo blandit. Donec maximus posuere commodo. Cras dictum erat erat. Pellentesque vulputate diam consequat nulla ultricies, in vehicula elit rhoncus. Donec ullamcorper, mauris at tristique elementum, erat lectus volutpat enim, non varius diam sem vitae erat. Duis at neque quis neque iaculis imperdiet nec quis leo.</p>
    </div>
</section>
  
  <section id="section4">
    <div id="box9" class="parallax" data-speed=".3"></div>
  </section>
  
</div><!-- section wrapper -->
</div> <!--smooth scroll-->
              
            
!

CSS

              
                body {
  background: red;
  margin: 0;
}

#overlay {
  mix-blend-mode: multiply;
  background-color: #1D3140;
  width: 45%;
  height: 100%;
  position: absolute;
  right: 0;
  top: 0;
}


#section1 {
  background: url("https://images.unsplash.com/photo-1557878499-95663e82c9d1?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1052&q=80");
  background-position: center center;
  background-size: cover;
  background-repeat: no-repeat;
  height: 100vh;
  display: flex;
  justify-content: space-around;
  align-items: center;
  position: relative;
}

#section2 {
  background: brown;
  height: 100vh;
  display: flex;
  justify-content: space-around;
  align-items: center;
}


#sectionPin {
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

.pin-wrap {
  background: pink;
  height: 100vh;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.pin-box {
  height: 100%;
  width: 100vw;
  background: green;
  border: 5px solid #fff;
}


#section3 {
  background: orange;
  padding: 5%;
  display: flex;
  justify-content: space-around;
}

#section4 {
  background: grey;
  padding: 10%;
  height: 100vh;
  display: flex;
  justify-content: center;
}

#box1 {
  height: 100px;
  width: 100px;
  background: red;
}

#box2 {
  height: 150px;
  width: 150px;
  background: blue;
}

#box3 {
  height: 250px;
  width: 250px;
  background: green;
  z-index: 1;
}

#box4 {
  height: 200px;
  width: 200px;
  background: orange;
}

#box5 {
  height: 200px;
  width: 200px;
  background: orange;
}

#box6 {
  height: 200px;
  width: 200px;
  background: orange;
}

#box7 {
  height: 200px;
  width: 400px;
  background: grey;
}

#box8 {
  width: 50%;
}

#box9 {
  width: 50%;
  height: 300px;
  background: purple;
}



              
            
!

JS

              
                gsap.registerPlugin(ScrollTrigger);


// Using Locomotive Scroll

const locoScroll = new LocomotiveScroll({
  el: document.querySelector(".smooth-scroll"),
  smooth: true
});
// each time Locomotive Scroll updates, tell ScrollTrigger to update too (sync positioning)
locoScroll.on("scroll", ScrollTrigger.update);

// tell ScrollTrigger to use these proxy methods for the ".smooth-scroll" element since Locomotive Scroll is hijacking things
ScrollTrigger.scrollerProxy(".smooth-scroll", {
  scrollTop(value) {
    return arguments.length ? locoScroll.scrollTo(value, 0, 0) : locoScroll.scroll.instance.scroll.y;
  }, // we don't have to define a scrollLeft because we're only scrolling vertically.
  getBoundingClientRect() {
    return {top: 0, left: 0, width: window.innerWidth, height: window.innerHeight};
  }
});






// GSAP PARALLAX - INDIVIDUAL ELEMENTS (while sharing class)

// get sections
var parallaxElements = Array.prototype.slice.call(document.querySelectorAll("section"));
var self = this;
	
// get box or parallax element inside each section
  parallaxElements.forEach(function(self) {
	  
    var boxTop = self.querySelectorAll(".parallaxTop");
    var box = self.querySelectorAll(".parallax");
    
    // animate boxes at top of page (section already in viewport)
    gsap.to(boxTop, {
      scrollTrigger: {
        scroller: ".smooth-scroll",
        scrub: true, 
        trigger: self, 
        start: "top 0%", 
        end: "bottom 0%", 
      }, 
      y: (i, target) => -innerHeight * target.dataset.speed,
      ease: "none"
    });
    
    // animate boxes when the relevant section comes into viewport
    gsap.to(box, {
      scrollTrigger: {
        scroller: ".smooth-scroll",
        scrub: true, 
        trigger: self, 
        start: "top 100%", 
        end: "bottom 0%", 
      }, 
      y: (i, target) => -innerHeight * target.dataset.speed,
      ease: "none"
    });
    
    
});



////////////////////////////////////

// get pinned boxes and box width
var pinBoxes = $('.pin-box');
var pinBoxWidth = pinBoxes.width();

// screen width 100vw equivalent
var windowWidth = $(window).innerWidth();

// get pin box wrpper and calc width based on window width X number of boxes
var pinWrap = $('.pin-wrap');
var pinWrapWidth = windowWidth * pinBoxes.length;

var horizontalScrollLength = (pinBoxes.length - 1) * windowWidth;

// give pin wrap a set width
$('.pin-wrap').width(pinWrapWidth);



console.log('pin box width', pinBoxWidth);
console.log('pin wrap total width', pinWrapWidth);
console.log('horizontal scroll', horizontalScrollLength);


// Pinning and horizontal scrolling

gsap.to(".pin-wrap", {
  scrollTrigger: {
    scroller: ".smooth-scroll",
    scrub: true,
    trigger: "#sectionPin",
    pin: "#sectionPin",
    // anticipatePin: 1,
    start: "top top",
    end: pinWrapWidth
  }, 
  x: -horizontalScrollLength,
  ease: "none"
});





////////////////////////////////////


//other animations
gsap.to("#box5", {
  scrollTrigger: {
    scroller: ".smooth-scroll",
    scrub: true,
    trigger: "#box5",
    start: "top bottom",
    end: "bottom top"
  }, 
  x: 500,
  ease: "none"
});


//timeline test
var tl = gsap.timeline({
    scrollTrigger: {
      trigger: "#section3",
      scroller: ".smooth-scroll",
      // scrub: true,
      start: "top 50%",
      // end: "+=100%",
      // markers: true,
      // id: "text panel"
    }
  });

tl.from("#box7", {scale: 0.3, x: "-100%", autoAlpha: 0})
  .from("#box8", {autoAlpha: 0, ease: "power2"})
// .to("#box7", {scale: 1.2, ease: "bounce"})


//toggle test
gsap.from("#box9", {
  scrollTrigger: {
    trigger: "#section4",
    scroller: ".smooth-scroll",
    toggleActions: "restart none none none",
    start: "top top",
    id: "bottom panel"
    // end: "top top"
  }, 
  rotation: 360,
  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

Console