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CSS

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HTML 

              
                <div class="brand" style="background:black; text-align:center;"><a href="https://www.creativecodingclub.com/bundles/creative-coding-club?src=cdp3droll" target="_blank"><img src="https://assets.codepen.io/32887/logo-ill.svg" width="300" alt="" /></a></div>
<div class="space" style="padding:20px; background:#efefef;">
	<h3>Use mouse wheel to scroll down and navigate Swiper gallery.</h3>
	<ul style="font-family:sans-serif;">
		<li>This is a rough proof of concept</li>
		<li>Not set up to be fully responsive</li>
		<li>There are intermittent glitches</li>
		<li>Use at own risk</li>
		<li><strong style="color:#600;">Zero support is offered for any fixes or updates</strong></li>
		<li>The community is welcome to hack on this and try to improve it</li>
	</ul>
	
	<h3>Swipe to unlock pining</h3>
	<p>When the gallery gets pinned be sure to Swipe until the last slide is visible</p>
	<p>Now you can scroll down to the rest of the page. Neat!</p>
	
	<h3>Known Issues</h3>
	<ul style="font-family:sans-serif;">
		<li>If you get to slide 6 and scroll all the way down, sometimes on the way up you can bypass the pinning and navigation through the Swiper gallery.</li>
		<li>Sometimes when going back up the page the pinned Swiper section glitches out. Elements flash and jump a bit. I have no idea what's going on here but I suspect the scroll position is jumping up and down.</li>
		<li>Attempting to use the Scrollbar while scrolling is disabled results in lots jitters and flasing.</li>
		<li>After page loads fresh, grab scrollbar and try to scroll down the full page. It becomes a mess when you hit the section that is trying to disable scrolling.</li>
	
	</ul>
	
	
	
	
	
</div>
<div class="gallery">
	

<div class="swiper">
	<div class="swiper-wrapper">
		<div class="swiper-slide red">
			<h1>A</h1>
			<h2>Is for Apple</h2>
		</div>
		<div class="swiper-slide gray">
			<h1>B</h1>
			<h2>Is for Banana</h2>
		</div>
		<div class="swiper-slide blue">
			<h1>C</h1>
			<h2>Is for Car</h2>
		</div>
		<div class="swiper-slide purple">
			<h1>D</h1>
			<h2>Is for Desk</h2>
		</div>
		<div class="swiper-slide orange">
			<h1>E</h1>
			<h2>Is for Eggs</h2>
		</div>
		<div class="swiper-slide green">
			<h1>F</h1>
			<h2>Is for Fabulous</h2>
		</div>
	</div>
</div>
<div id="currentSlide" style="font-size:4vh; font-weight:bold; font-family:sans-serif; width:8em; padding:20px; background:#ccc; border-radius:2.5em; text-align:center; margin:20px auto auto auto">1</div>

</div>
<div class="space" style="padding:20px; background:#efefef;">

	
	<h3>Closing Thoughts</h3>
	<p>Even though this seems like a neat UI treatment, it is very strange to lock the scrollbar in place. I really don't think the user should be prevented from using a scrollbar. I tried hiding the scrollbar by setting <span style="font-family:Courier, serif; font-weight:bold;">visibility:hidden</span> on body when scrolling should be disabled but that was weird too. </p>
	
	<p>I would suggest the following 3 alternatives</p>
	<ol>
		<li>Do <strong>not pin</strong> the Swiper section. Provide a clear UI for horizontal navigation with prev/next buttons and make it clear that swiping is allowed too.</li>
		<li>Ditch Swiper. Pin the section and control it with a <a href="https://greensock.com/3-8/#containerAnimation" target="_blank">container animation</a>. Using this technique the scroll-wheel and scrollbar can be used consistently with no lockups or funny business.</li>
		<li>Create a full-screen experience where the <strong>scrollbar is always hidden</strong> and the only way to navigate is via scrollwheel or touch gestures. </li>
	
	</ol>
	
</div>
<div class="brand" style="background:black; text-align:center;"><a href="https://www.creativecodingclub.com/bundles/creative-coding-club?src=cdp3droll" target="_blank"><img src="https://assets.codepen.io/32887/logo-ill.svg" width="300" alt="" /></a></div>
!

CSS 

              
                * {
	position:relative;
	box-sizing:border-box;
}


body, html {
	height:100%
}

body {
	margin:0;
	background:#1d1d1d;
 
}

li {
	margin-top:0.8em;
}
h1, h2 {
	margin:0;
}

h1 {
	font-size:clamp(200px, 20vw, 20vh);
	line-height:0.8em;
}

h2 {
	font-size:clamp(30px, 10vw, 6vh);
}

h3 {
	padding-top:2em;
	margin:0;
	
}

p, h3, li, h2 {
	font-family:sans-serif;
	max-width:600px;
}

p, li {
	line-height:1.4em;
}



.slideWrapper {
	height:50vh;
	width:90%;
	background:yellow;
}


.swiper {
	height:50vh;
	width:90%;
	
	margin:auto;
}

.swiper-slide {
	text-align: center;
	font-size: 18px;
	background: #fff;

	/* Center slide text vertically */
	
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction:column;
}

.swiper-slide img {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
}
.gray {
	background-color: #777;
	background-image: radial-gradient(
			circle at 47% 14%,
			rgba(205, 205, 205, 0.04) 0%,
			rgba(205, 205, 205, 0.04) 43%,
			transparent 43%,
			transparent 100%
		),
		radial-gradient(
			circle at 35% 12%,
			rgba(215, 215, 215, 0.04) 0%,
			rgba(215, 215, 215, 0.04) 4%,
			transparent 4%,
			transparent 100%
		),
		radial-gradient(
			circle at 1% 35%,
			rgba(24, 24, 24, 0.04) 0%,
			rgba(24, 24, 24, 0.04) 37%,
			transparent 37%,
			transparent 100%
		),
		radial-gradient(
			circle at 21% 1%,
			rgba(0, 0, 0, 0.04) 0%,
			rgba(0, 0, 0, 0.04) 26%,
			transparent 26%,
			transparent 100%
		),
		radial-gradient(
			circle at 23% 82%,
			rgba(249, 249, 249, 0.04) 0%,
			rgba(249, 249, 249, 0.04) 60%,
			transparent 60%,
			transparent 100%
		),
		radial-gradient(
			circle at 11% 54%,
			rgba(251, 251, 251, 0.04) 0%,
			rgba(251, 251, 251, 0.04) 23%,
			transparent 23%,
			transparent 100%
		),
		radial-gradient(
			circle at 69% 68%,
			rgba(234, 234, 234, 0.04) 0%,
			rgba(234, 234, 234, 0.04) 10%,
			transparent 10%,
			transparent 100%
		),
		linear-gradient(90deg, #777, #606060);
}
.blue {
	background-color: #2c7ad2;
	background-image: radial-gradient(
			circle at 47% 14%,
			rgba(205, 205, 205, 0.04) 0%,
			rgba(205, 205, 205, 0.04) 43%,
			transparent 43%,
			transparent 100%
		),
		radial-gradient(
			circle at 35% 12%,
			rgba(215, 215, 215, 0.04) 0%,
			rgba(215, 215, 215, 0.04) 4%,
			transparent 4%,
			transparent 100%
		),
		radial-gradient(
			circle at 1% 35%,
			rgba(24, 24, 24, 0.04) 0%,
			rgba(24, 24, 24, 0.04) 37%,
			transparent 37%,
			transparent 100%
		),
		radial-gradient(
			circle at 21% 1%,
			rgba(0, 0, 0, 0.04) 0%,
			rgba(0, 0, 0, 0.04) 26%,
			transparent 26%,
			transparent 100%
		),
		radial-gradient(
			circle at 23% 82%,
			rgba(249, 249, 249, 0.04) 0%,
			rgba(249, 249, 249, 0.04) 60%,
			transparent 60%,
			transparent 100%
		),
		radial-gradient(
			circle at 11% 54%,
			rgba(251, 251, 251, 0.04) 0%,
			rgba(251, 251, 251, 0.04) 23%,
			transparent 23%,
			transparent 100%
		),
		radial-gradient(
			circle at 69% 68%,
			rgba(234, 234, 234, 0.04) 0%,
			rgba(234, 234, 234, 0.04) 10%,
			transparent 10%,
			transparent 100%
		),
		linear-gradient(90deg, #2c7ad2, #1568c6);
}
.orange {
	background-color: #e77614;
	background-image: radial-gradient(
			circle at 46% 40%,
			rgba(228, 228, 228, 0.06) 0%,
			rgba(228, 228, 228, 0.06) 13%,
			transparent 13%,
			transparent 100%
		),
		radial-gradient(
			circle at 11% 41%,
			rgba(198, 198, 198, 0.06) 0%,
			rgba(198, 198, 198, 0.06) 19%,
			transparent 19%,
			transparent 100%
		),
		radial-gradient(
			circle at 52% 23%,
			rgba(14, 14, 14, 0.06) 0%,
			rgba(14, 14, 14, 0.06) 69%,
			transparent 69%,
			transparent 100%
		),
		radial-gradient(
			circle at 13% 85%,
			rgba(148, 148, 148, 0.06) 0%,
			rgba(148, 148, 148, 0.06) 44%,
			transparent 44%,
			transparent 100%
		),
		radial-gradient(
			circle at 57% 74%,
			rgba(232, 232, 232, 0.06) 0%,
			rgba(232, 232, 232, 0.06) 21%,
			transparent 21%,
			transparent 100%
		),
		radial-gradient(
			circle at 59% 54%,
			rgba(39, 39, 39, 0.06) 0%,
			rgba(39, 39, 39, 0.06) 49%,
			transparent 49%,
			transparent 100%
		),
		radial-gradient(
			circle at 98% 38%,
			rgba(157, 157, 157, 0.06) 0%,
			rgba(157, 157, 157, 0.06) 24%,
			transparent 24%,
			transparent 100%
		),
		radial-gradient(
			circle at 8% 6%,
			rgba(60, 60, 60, 0.06) 0%,
			rgba(60, 60, 60, 0.06) 12%,
			transparent 12%,
			transparent 100%
		),
		linear-gradient(90deg, #ff7600, #ff7600);
}

.red {
	background-color: #c82736;
	background-image: radial-gradient(
			circle at 19% 90%,
			rgba(190, 190, 190, 0.04) 0%,
			rgba(190, 190, 190, 0.04) 17%,
			transparent 17%,
			transparent 100%
		),
		radial-gradient(
			circle at 73% 2%,
			rgba(78, 78, 78, 0.04) 0%,
			rgba(78, 78, 78, 0.04) 94%,
			transparent 94%,
			transparent 100%
		),
		radial-gradient(
			circle at 45% 2%,
			rgba(18, 18, 18, 0.04) 0%,
			rgba(18, 18, 18, 0.04) 55%,
			transparent 55%,
			transparent 100%
		),
		radial-gradient(
			circle at 76% 60%,
			rgba(110, 110, 110, 0.04) 0%,
			rgba(110, 110, 110, 0.04) 34%,
			transparent 34%,
			transparent 100%
		),
		radial-gradient(
			circle at 68% 56%,
			rgba(246, 246, 246, 0.04) 0%,
			rgba(246, 246, 246, 0.04) 16%,
			transparent 16%,
			transparent 100%
		),
		radial-gradient(
			circle at 71% 42%,
			rgba(156, 156, 156, 0.04) 0%,
			rgba(156, 156, 156, 0.04) 47%,
			transparent 47%,
			transparent 100%
		),
		radial-gradient(
			circle at 46% 82%,
			rgba(247, 247, 247, 0.04) 0%,
			rgba(247, 247, 247, 0.04) 39%,
			transparent 39%,
			transparent 100%
		),
		radial-gradient(
			circle at 50% 47%,
			rgba(209, 209, 209, 0.04) 0%,
			rgba(209, 209, 209, 0.04) 45%,
			transparent 45%,
			transparent 100%
		),
		linear-gradient(90deg, #e53949, #cc2232);
}

.purple {
	background-color: #8d3dae;
	background-image: radial-gradient(
			circle at 47% 14%,
			rgba(205, 205, 205, 0.04) 0%,
			rgba(205, 205, 205, 0.04) 43%,
			transparent 43%,
			transparent 100%
		),
		radial-gradient(
			circle at 35% 12%,
			rgba(215, 215, 215, 0.04) 0%,
			rgba(215, 215, 215, 0.04) 4%,
			transparent 4%,
			transparent 100%
		),
		radial-gradient(
			circle at 1% 35%,
			rgba(24, 24, 24, 0.04) 0%,
			rgba(24, 24, 24, 0.04) 37%,
			transparent 37%,
			transparent 100%
		),
		radial-gradient(
			circle at 21% 1%,
			rgba(0, 0, 0, 0.04) 0%,
			rgba(0, 0, 0, 0.04) 26%,
			transparent 26%,
			transparent 100%
		),
		radial-gradient(
			circle at 23% 82%,
			rgba(249, 249, 249, 0.04) 0%,
			rgba(249, 249, 249, 0.04) 60%,
			transparent 60%,
			transparent 100%
		),
		radial-gradient(
			circle at 11% 54%,
			rgba(251, 251, 251, 0.04) 0%,
			rgba(251, 251, 251, 0.04) 23%,
			transparent 23%,
			transparent 100%
		),
		radial-gradient(
			circle at 69% 68%,
			rgba(234, 234, 234, 0.04) 0%,
			rgba(234, 234, 234, 0.04) 10%,
			transparent 10%,
			transparent 100%
		),
		linear-gradient(90deg, #8d3dae, #8d3dae);
}
.green {
	background-color: #28a92b;
	background-image: radial-gradient(
			circle at 46% 40%,
			rgba(228, 228, 228, 0.06) 0%,
			rgba(228, 228, 228, 0.06) 13%,
			transparent 13%,
			transparent 100%
		),
		radial-gradient(
			circle at 11% 41%,
			rgba(198, 198, 198, 0.06) 0%,
			rgba(198, 198, 198, 0.06) 19%,
			transparent 19%,
			transparent 100%
		),
		radial-gradient(
			circle at 52% 23%,
			rgba(14, 14, 14, 0.06) 0%,
			rgba(14, 14, 14, 0.06) 69%,
			transparent 69%,
			transparent 100%
		),
		radial-gradient(
			circle at 13% 85%,
			rgba(148, 148, 148, 0.06) 0%,
			rgba(148, 148, 148, 0.06) 44%,
			transparent 44%,
			transparent 100%
		),
		radial-gradient(
			circle at 57% 74%,
			rgba(232, 232, 232, 0.06) 0%,
			rgba(232, 232, 232, 0.06) 21%,
			transparent 21%,
			transparent 100%
		),
		radial-gradient(
			circle at 59% 54%,
			rgba(39, 39, 39, 0.06) 0%,
			rgba(39, 39, 39, 0.06) 49%,
			transparent 49%,
			transparent 100%
		),
		radial-gradient(
			circle at 98% 38%,
			rgba(157, 157, 157, 0.06) 0%,
			rgba(157, 157, 157, 0.06) 24%,
			transparent 24%,
			transparent 100%
		),
		radial-gradient(
			circle at 8% 6%,
			rgba(60, 60, 60, 0.06) 0%,
			rgba(60, 60, 60, 0.06) 12%,
			transparent 12%,
			transparent 100%
		),
		linear-gradient(90deg, #28a92b, #10a614);
}
!

JS 

              
                const swiper = new Swiper('.swiper', {})
const numPanels = swiper.slides.length;
console.log(numPanels)


// Gsap Code
let currentIndex = 0;
let animating;


swiper.on('slideChange', function () {
  currentSlide.textContent = swiper.activeIndex + 1
  gsap.to(swiper.slides[swiper.activeIndex], {scale:1, opacity:1})
  gsap.to(swiper.slides[swiper.previousIndex], {opacity:0.3, scale:0.8})
  swiper.slides[swiper.previousIndex].animation.pause(0)
  swiper.slides[swiper.activeIndex].animation.restart()
	currentIndex = swiper.activeIndex
});

swiper.on('slideChangeTransitionEnd', function() {
	animating = false
})

swiper.slides.forEach((slide, index)=>{
	let letter = slide.querySelector("h1")
	let description = slide.querySelector("h2")
	let chars = SplitText.create(description, {type:"chars"})
	let tl = gsap.timeline({paused:true, onComplete:function(){
		
	}})
	tl.from(letter, {scale:0, opacity:0, ease:"back", duration:1})
	  .from(chars.chars, {opacity:0, yPercent:50, stagger:0.02}, "-=0.5")
	
	slide.animation = tl
})

swiper.slides[0].animation.play()



/*


ALL OF THE FOLLOWING CODE IS BORROWED FROM THIS PEN FROM GREENSOCK
https://codepen.io/GreenSock/pen/MWGVJYL?editors=1000

I MADE SLIGHT ALTERATIONS TO MAKE GOTOPANEL() TALK TO SWIPER

*/





// create an observer and disable it to start
let intentObserver = ScrollTrigger.observe({
  type: "wheel,touch",
  onUp: () => !animating && gotoPanel(currentIndex + 1, true),
  onDown: () => !animating && gotoPanel(currentIndex - 1, false),
  wheelSpeed: -1, // to match mobile behavior, invert the wheel speed
  tolerance: 30,
  preventDefault: true,
  onPress: self => {
    // on touch devices like iOS, if we want to prevent scrolling, we must call preventDefault() on the touchstart (Observer doesn't do that because that would also prevent side-scrolling which is undesirable in most cases)
    ScrollTrigger.isTouch && self.event.preventDefault()
  }
})
intentObserver.disable();

let preventScroll = ScrollTrigger.observe({
			preventDefault: true,
			type: "wheel,scroll",
			allowClicks: true,
			onEnable: self => {
			console.log("enable")	
				return self.savedScroll = self.scrollY()
			}, // save the scroll position
			onChangeY: self => {
				console.log("disable")
				self.scrollY(self.savedScroll)    // refuse to scroll
			}
		});
preventScroll.disable();

// handle the panel swipe animations
function gotoPanel(index, isScrollingDown) {
  animating = true;
	console.log("gotoPanel")
  // return to normal scroll if we're at the end or back up to the start
  if (
    (index === numPanels && isScrollingDown) ||
    (index === -1 && !isScrollingDown)
  ) {
	  console.log("return to normal scroll")
    intentObserver.disable();
    preventScroll.disable();
	  
    animating = false;
    // now make it go 1px beyond in the correct direction so that it doesn't trigger onEnter/onEnterBack.
    preventScroll.scrollY(preventScroll.scrollY() + (index === numPanels ? 1 : -1));
    return;
  }
  console.log("call swiper slideTo()")
	swiper.slideTo(index)
	
  currentIndex = index;
}

// pin swipe section and initiate observer
ScrollTrigger.create({
  trigger: ".gallery",
  pin: true,
  anticipatePin: true,
  start: "top top",
  end: "+=50%",
  onEnter: (self) => {
    if (preventScroll.isEnabled === false) {
      self.scroll(self.start);
      preventScroll.enable();
      intentObserver.enable();
		 
      gotoPanel(currentIndex + 1, true);
    }
  },
  onEnterBack: (self) => {
    if (preventScroll.isEnabled === false) {
      self.scroll(self.start);
      preventScroll.enable();
      intentObserver.enable();
		 
      gotoPanel(currentIndex - 1, false);
    }
  }
});


ScrollTrigger.config({ 
  ignoreMobileResize: true
});
!
999px

Console