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HTML 

              
                <div id="wrapper">
 <section id="content">
  <!--  smooth scrolling biz goes in here -->

  <div class="faq__accordion js-accordion">
   <div class="faq__accordion__header js-accordion__header">
    <div class="faq__accordion__header__title">Why should I buy a Cosmic Egg?</div>
    <div class="faq__accordion__header__icon js-accordion__header__icon"><svg width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg">
      <path d="M10 5V15" stroke="black" stroke-width="1.5" stroke-linecap="round"></path>
      <path d="M15 10L5 10" stroke="black" stroke-width="1.5" stroke-linecap="round"></path>
     </svg>
    </div>
   </div>
   <div class="faq__accordion__content__wrapper js-accordion__body__wrapper" style="max-height: 560px;">
    <div class="faq__accordion__content js-accordion__body">
     <p class="faq__accordion__content__text">
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dicta quis illum delectus placeat id illo cum est voluptatum qui similique accusamus vitae veritatis ab dolorem voluptatibus error, velit iure alias laudantium! Provident esse obcaecati impedit omnis maxime. Illum nemo numquam eos, beatae a voluptatum recusandae dolorum minima eius qui maxime earum accusamus facilis nulla mollitia nam aspernatur cupiditate necessitatibus enim alias quod consectetur accusantium ex. In maxime laboriosam, ullam aut tempora exercitationem natus dolores facilis. Excepturi voluptate cum assumenda quisquam, nesciunt esse possimus dolorem deleniti quidem eaque iure reprehenderit ipsum. Ducimus est enim rem at quisquam cumque, recusandae ut. Amet.
     </p>
    </div>
   </div>
  </div>

  <section class="image-grid container">
   <div class="image_cont" data-speed="1">
    <img data-speed="auto" src="https://images.unsplash.com/photo-1556856425-366d6618905d?ixid=MnwxMjA3fDB8MHxzZWFyY2h8MTV8fG5lb258ZW58MHx8MHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=400&q=60" alt="">
   </div>
   <div class="image_cont" data-speed="1.7">
    <img data-speed="auto" src="https://images.unsplash.com/photo-1520271348391-049dd132bb7c?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=400&q=80" alt="">
   </div>
   <div class="image_cont" data-speed="1.5">
    <img data-speed="auto" src="https://images.unsplash.com/photo-1609166214994-502d326bafee?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=400&q=80" alt="">
   </div>
  </section>

  <section class="title container flow--lg">
   <h1><span class="eyebrow" aria-hidden="true">with </span>GSAP scrollsmoother</h1>
   <p>Seamlessly integrated with GSAP and ScrollTrigger. Leveraging native scrolling - no "fake" scrollbars or event hijacking.</p>
  </section>

  <section class="bars container">

   <div class="bars-text">
    <div class="flow content">
     <h2>Speed Control</h2>
     <p>Animate elements along at different speeds, slow them down or make them whizz past.</p>
    </div>

   </div>

   <div class="bars-cont">
    <div class="bar" data-speed="0.8">
     <p>0.8</p>
    </div>

    <div class="bar" data-speed="0.9">
     <p>0.9</p>
    </div>

    <div class="bar" data-speed="1">
     <p>1</p>
    </div>

    <div class="bar" data-speed="1.1">
     <p>1.1</p>
    </div>

    <div class="bar" data-speed="1.2">
     <p>1.2</p>
    </div>
   </div>

  </section>

  <section class="v-center">
   <div class="parallax-slab">
    <img data-speed="auto" src="https://assets.codepen.io/756881/smoothscroller-1.jpg" alt="">
   </div>
  </section>

  <section class="staggered container">

   <div class="staggered_text">
    <div class="flow content">
     <h2>Add some lag (the good kind!)</h2>
     <p>loosen the connection to the scroll to give a feeling of 'follow through.'</p>
    </div>

   </div>

   <div class="staggered_demo">
    <h3 id="split-stagger">stagger...</h3>
   </div>

  </section>

  <section class="parallax-images container">
   <div class="parallax-text">
    <div class="flow content">
     <h2>Easy parallax image effects</h2>
     <p>Pop your images in a container with overflow hidden, size them a little larger than the container and set data-speed to auto. GSAP does the rest.</p>
    </div>
   </div>

   <div class="image_cont">
    <img data-speed="auto" src="https://assets.codepen.io/756881/neon3.jpg" alt="">
   </div>
   <div class="image_cont">
    <img data-speed="auto" src="https://assets.codepen.io/756881/neon2.jpg" alt="">
   </div>
  </section>

  <div class="footer">END</div>
 </section>
</div>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500&display=swap");

@font-face {
 font-family: "wild_worldbold";
 src: url("https://assets.codepen.io/756881/wild_world-webfont.woff2")
   format("woff2"),
  url("https://assets.codepen.io/756881/wild_world-webfont.woff") format("woff");
 font-weight: normal;
 font-style: normal;
}

/* @link https://utopia.fyi/type/calculator?c=320,20,1.2,1140,24,1.25,1,0,&s=0.75|0.5|0.25,1.5|2|3|4|6,s-l */

:root {
 --fluid-min-width: 320;
 --fluid-max-width: 1140;

 --fluid-screen: 100vw;
 --fluid-bp: calc(
  (var(--fluid-screen) - var(--fluid-min-width) / 16 * 1rem) /
   (var(--fluid-max-width) - var(--fluid-min-width))
 );
}

@media screen and (min-width: 1140px) {
 :root {
  --fluid-screen: calc(var(--fluid-max-width) * 1px);
 }
}

:root {
 --f-0-min: 18;
 --f-0-max: 20;
 --step-0: calc(
  ((var(--f-0-min) / 16) * 1rem) + (var(--f-0-max) - var(--f-0-min)) *
   var(--fluid-bp)
 );

 --f-1-min: 20;
 --f-1-max: 24;
 --step-1: calc(
  ((var(--f-1-min) / 16) * 1rem) + (var(--f-1-max) - var(--f-1-min)) *
   var(--fluid-bp)
 );
}

* {
 box-sizing: border-box;
}

body {
 background-color: #111;
 font-family: "Open Sans", sans-serif;
 color: white;
 overscroll-behavior: none;
 margin: 0;
 padding: 0;
 font-weight: 300;
 overflow-x: hidden;
 font-size: var(--step-0);
}

section {
 min-height: 100vh;
}

p {
 line-height: 1.35;
}

#content {
 padding: 0 0.75rem;
}

.container {
 max-width: 1100px;
 margin: 0 auto;
 padding: 0 0.5rem;
}

h1,
h2,
h3,
h4,
p {
 margin: 0;
}

.flow--lg > * + * {
 margin-top: 2em;
}

.flow > * + * {
 margin-top: 1em;
}

.title {
 text-align: center;
 display: flex;
 align-items: center;
 justify-content: center;
 flex-direction: column;
 min-height: 50vh;
}

#content {
 overflow: visible;
 width: 100%;
}

.heading {
 position: relative;
 top: 50vh;
 left: 50%;
 transform: translateX(-50%);
 opacity: 0;
}

h1 {
 font-size: clamp(12px, 8vw, 100px);
 text-align: center;
 line-height: 0.67;
 margin: 0 auto;
 font-family: "wild_worldbold";

 .eyebrow {
  font-family: "Open sans", sans-serif;
  font-size: clamp(12px, 3vw, 40px);
  font-weight: 400;
 }
}

.heading p {
 font-family: "wild_worldbold";
 font-size: 15.5vw;
 font-size: clamp(12px, 15.5vw, 250px);
 text-align: center;
 line-height: 0.67;
 margin: 0;
 text-align: center;
 color: #111;
 -webkit-text-stroke-width: 1.5px;
 -webkit-text-stroke-color: white;
 z-index: -10;
}

.intro,
h2,
h3 {
 font-size: var(--step-1);
 font-weight: 500;
}

.text-container {
 position: relative;
}

.text-container p {
 position: relative;
 top: 0;
 left: 0;
 right: 0;
 z-index: 999;
 color: transparent;
}

.text-container p:first-child {
 position: relative;
 top: 0;
 left: 0;
 right: 0;
 z-index: 999;
 color: white;
}

.image-grid {
 position: relative;
 display: grid;
 grid-template-columns: repeat(3, 1fr);
 grid-template-rows: repeat(3, 1fr);
 grid-column-gap: 0.2rem;
 grid-row-gap: 0.2rem;
 width: 70vw;
 margin: 0 auto;
 padding-top: 40vh;
 z-index: -1;

 .image_cont {
  position: relative;
  aspect-ratio: 1/1;
  overflow: hidden;
 }

 img {
  position: relative;
  top: 0;
  width: 100%;
  height: 150%;
  object-fit: cover;
 }

 .image_cont:nth-child(1) {
  grid-column: 1;
  grid-row: 1;
 }

 .image_cont:nth-child(2) {
  grid-column: 3;
  grid-row: 2;
 }

 .image_cont:nth-child(3) {
  grid-column: 2;
  grid-row: 3;
 }
}

.parallax-images {
 margin-top: 10vh;
 padding: 10rem 1rem;
 display: grid;
 grid-template-columns: repeat(2, 1fr);
 grid-column-gap: 1rem;
 grid-row-gap: 20vh;
 align-items: center;
 justify-items: center;

 .image_cont {
  position: relative;
  height: 80vh;
  overflow: hidden;
 }

 img {
  position: relative;
  bottom: 0;
  margin: 0 auto;
  height: 140%;
  width: 100%;
  object-fit: cover;
 }

 .parallax-text {
  grid-column: 2;
  grid-row: 1;
 }

 .image_cont:nth-child(2) {
  grid-column: 1 / span 1;
  grid-row: 1;
  width: 100%;
 }

 .image_cont:nth-child(3) {
  grid-column: 2 / span 1;
  grid-row: 2;
 }
}

.footer {
 background-color: red;
 width: 100%;
 text-align: center;
 font-size: 20em;
}

.spacer {
 min-height: 50vh;
 display: flex;
 align-items: center;
 justify-content: center;
}

.stagger {
 font-size: 8vw;
}

.bars {
 display: flex;
 flex-wrap: wrap;
 column-gap: 4rem;

 .bars-text {
  flex: 1 1 300px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
 }

 .bars-cont {
  flex: 1 1 500px;
  display: flex;
  width: 100%;
  height: 60vh;
  align-items: flex-end;
 }

 .bar {
  border-radius: 10px;
  margin: 2vw;
  text-align: center;
  flex: 1 0 auto;
  font-size: var(--step-0);
  justify-self: flex-end;
  font-family: "wild_worldbold";
  font-size: clamp(16px, 3vw, 36px);
 }
}

.content {
 border-left: solid 1px white;
 padding: 0.5rem 2rem;
}

.staggered {
 display: flex;
 align-items: center;
 flex-wrap: wrap;
 column-gap: 4rem;

 h3 {
  font-family: "wild_worldbold";
  font-size: clamp(16px, 6vw, 80px);
  letter-spacing: 0.03em;
 }

 &_text {
  flex: 1 1 300px;
 }

 &_demo {
  flex: 1 1 500px;
  display: flex;
  align-items: center;
  justify-content: center;
 }
}

.parallax-slab {
 position: relative;
 height: 500px;
 width: 100%;
 max-height: 500px;
 overflow: hidden;

 img {
  position: relative;
  bottom: 0;
  width: 100%;
  height: 180%;
  object-fit: cover;
 }
}

.v-center {
 display: flex;
 align-items: center;
}

.spacer {
 height: 10vh;
}

//faq
.faq {
 &__title {
  margin-bottom: toRem(100);
  opacity: 0;
 }

 &__accordion {
  display: flex;
  flex-direction: column;
  max-width: 600px;
  border-bottom: 1px solid green;

  &__container {
   opacity: 0;
  }

  &__header {
   display: flex;
   align-items: center;
   justify-content: space-between;
   padding: toRem(30) 0;
   cursor: pointer;

   &__title {
    letter-spacing: 0.05em;
    font-weight: 700;
   }

   &__icon {
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.4s ease;
    pointer-events: none;
   }

   .is-open &__icon {
    transform: rotate(45deg);
   }
  }

  &__content {
   padding: toRem(40) 0;

   &__wrapper {
    max-height: 0;
    transition: all 0.4s ease;
    overflow: hidden;
   }

   &__text {
    line-height: 200%;
    letter-spacing: 0.05em;
    white-space: pre-wrap;

    // list bullet
    span {
     padding-left: toRem(80);
    }

    a {
     text-decoration: underline;
    }
   }
  }
 }
}
!

JS 

              
                gsap.registerPlugin(ScrollTrigger, ScrollSmoother, SplitText);

// create the smooth scroller FIRST!
const smoother = ScrollSmoother.create({
 wrapper: "#wrapper",
 content: "#content",
 smooth: 1,
 normalizeScroll: true, // prevents address bar from showing/hiding on most devices, solves various other browser inconsistencies
 ignoreMobileResize: true, // skips ScrollTrigger.refresh() on mobile resizes from address bar showing/hiding
 effects: true,
 preventDefault: true
});

gsap.set(".heading", {
 yPercent: -150,
 opacity: 1
});

let tl = gsap.timeline();
let mySplitText = new SplitText("#split-stagger", { type: "words,chars" });
let chars = mySplitText.chars;

chars.forEach((char, i) => {
 smoother.effects(char, { speed: 1, lag: (i + 1) * 0.1 });
});

const states = {
 isOpen: "is-open",
 isHidden: "is-hidden"
};

const accordionsElements = Array.from(
 document.querySelectorAll(".js-accordion")
);

const accordions = accordionsElements.map((accordion) => {
 return {
  parent: accordion,
  header: accordion.querySelector(".js-accordion__header"),
  body: accordion.querySelector(".js-accordion__body__wrapper"),
  bodyInner: accordion.querySelector(".js-accordion__body"),
  open: false
 };
});

accordions.forEach((accordion) => {
 accordion.header.addEventListener("click", headerClickHandler);
});

function headerClickHandler(e) {
 console.log("headerCLick");
 e.preventDefault();
 accordions.forEach((accordion) => {
  if (e.target === accordion.header) {
   toggleAccordion(accordion);
  } else {
   closeAccordion(accordion);
  }

  //   REFRESH
  ScrollTrigger.refresh();
 });

 // const previouslyCreatedSmoother = getScrollbar();
 ScrollTrigger.refresh();
}

function toggleAccordion(accordion) {
 accordion.open ? closeAccordion(accordion) : showAccordion(accordion);
}

function showAccordion(accordion) {
 accordion.open = true;
 accordion.parent.classList.add(states.isOpen);
 const contentHeight = accordion.bodyInner.clientHeight;
 accordion.body.style.maxHeight = contentHeight + "px";
}

function closeAccordion(accordion) {
 accordion.open = false;
 accordion.parent.classList.remove(states.isOpen);
 accordion.body.style.maxHeight = 0;
}
!
999px

Console