Animation de défilement parallaxe

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                                    <g id="info">
                            <polygon id="arrow" points="353.93 368.91 356.06 366.79 374.26 385 392.47 366.79 394.59 368.91 374.26 389.24 353.93 368.91" fill="#fff" stroke="#231f20" stroke-miterlimit="10" stroke-width="0.5"/>
                            <path id="text" d="M261.62,345.74c8.46,7,22.53-4.51,8.16-9.84-17.91-5.31-3.78-24.1,9.06-16.36L277.69,323c-8.32-5.73-19.5,5.41-5.8,9.55,18.58,6.42,2.18,25.66-11.33,16.74ZM302.54,350c-23.47,10.27-23.65-31.11.1-21.64l-1,3.27c-17.3-7.88-16.61,23.5.14,15.21Zm4.94-15.11c0-2.74,0-5.09-.19-7.25H311l.14,4.56h.19c1.19-3.52,4.35-5.66,7.63-4.94v4c-10.08-1.88-6.76,14-7.29,19.63h-4.18ZM343.71,339c.06,16.73-23.06,16-22.7.39C320.43,323.17,344.34,323.23,343.71,339Zm-18.43.24c-.33,11.66,14.44,11.71,14.11-.09C340.37,327.86,324.33,327.6,325.28,339.26ZM349,316.76h4.22v34.07H349Zm11.32,0h4.23v34.07h-4.23ZM382,318.92c35.43-9.2,34.89,39.64,0,31.81Zm4.18,28.6c23.33,5.69,24.08-31.95,0-25.53ZM435,339c.06,16.73-23.06,16-22.7.39C411.73,323.17,435.64,323.23,435,339Zm-18.43.24c-.33,11.66,14.43,11.71,14.11-.09C431.67,327.86,415.63,327.6,416.58,339.26Zm25.09-11.66c1.21,4.84,3.94,14.5,4.8,19.2h.15c1-4.69,4.38-14.43,5.85-19.2H456c1.44,4.8,4.69,14.59,5.66,19.2h.15c.7-4.59,3.81-14.45,5.08-19.2h4.18l-7.49,23.23h-3.84c-1.53-5-4.6-13.66-5.61-18.72h-.1c-1,5.17-4.22,13.71-5.85,18.72h-3.84l-7-23.23Zm33.63,6.29c0-2.4,0-4.37-.19-6.29h3.75l.24,3.84h.09c14.6-14.27,17.39,7,15.88,19.39h-4.22c-1-5.08,3.26-20.32-5.37-20.25-9.13,0-5.12,15-6,20.25H475.3Z"

CSS

body,
html{
      margin: 0;
      padding: 0;
      height: 100%;
}

/* Hide scrollbar for Chrome, Safari and Opera */
body::-webkit-scrollbar {
  display: none;
}

/* Hide scrollbar for IE, Edge and Firefox */
body {
  -ms-overflow-style: none;  /* IE and Edge */
  scrollbar-width: none;  /* Firefox */
}

svg {
      display: block;
      width: 100%;
      height: 100vh;
      position: fixed;
      top: 0;
      left: 0;
}
  
.scrollElement {
      position: absolute;
      height: 6000px;
      width: 100px;
      top: 0;
      z-index: 0;
}

.btn {
      position: fixed;
      bottom: 5%;
      right: 0px;
      transform: translateX(-50%);
      border: 1px solid #fff;
      border-radius: 5px;
      font-size: 0.9rem;
      padding: 0.5rem 0.7em;
      background-color: transparent;
      color: #ffffff;
      font-family: Verdana, Geneva, Tahoma, sans-serif;
      -webkit-font-smoothing: antialiased;
      cursor: pointer;
      transition: all .3s;
      z-index: 11;
  }

.btn_works {
      left: 100px;
      right: unset;
      text-decoration: none;
  }

.btn:hover {
      background: #ffffff;
      color: #1B1734;
  }

gsap.registerPlugin(ScrollTrigger);
    let speed = 200;
    let scene1 = gsap.timeline();
    ScrollTrigger.create({
        animation: scene1,
        trigger: ".scrollElement",
        start: "top top",
        end: "45% 100%",
        scrub: 3,
    });

// hills animation 
    scene1.to("#h1-1", { y: 3 * speed, x: 1 * speed, scale: 0.9, ease: "power1.in" }, 0)
    scene1.to("#h1-2", { y: 2.6 * speed, x: -0.6 * speed, ease: "power1.in" }, 0)
    scene1.to("#h1-3", { y: 1.7 * speed, x: 1.2 * speed }, 0.03)
    scene1.to("#h1-4", { y: 3 * speed, x: 1 * speed }, 0.03)
    scene1.to("#h1-5", { y: 2 * speed, x: 1 * speed }, 0.03)
    scene1.to("#h1-6", { y: 2.3 * speed, x: -2.5 * speed }, 0)
    scene1.to("#h1-7", { y: 5 * speed, x: 1.6 * speed }, 0)
    scene1.to("#h1-8", { y: 3.5 * speed, x: 0.2 * speed }, 0)
    scene1.to("#h1-9", { y: 3.5 * speed, x: -0.2 * speed }, 0)

//animate text
    scene1.to("#info", { y: 8 * speed }, 0)

/*   Bird   */
    gsap.fromTo("#bird", { opacity: 1 }, {
        y: -250,
        x: 800,
        ease: "power2.out",
        scrollTrigger: {
            trigger: ".scrollElement",
            start: "15% top",
            end: "60% 100%",
            scrub: 4,
            onEnter: function() { gsap.to("#bird", { scaleX: 1, rotation: 0 }) },
            onLeave: function() { gsap.to("#bird", { scaleX: -1, rotation: -15 }) },
        }
    })

/* Clouds  */
    let clouds = gsap.timeline();
    ScrollTrigger.create({
        animation: clouds,
        trigger: ".scrollElement",
        start: "top top",
        end: "70% 100%",
        scrub: 1,
    });

clouds.to("#cloud1", { x: 500 }, 0)
    clouds.to("#cloud2", { x: 1000 }, 0)
    clouds.to("#cloud3", { x: -1000 }, 0)
    clouds.to("#cloud4", { x: -700, y: 25 }, 0)

/* Sun motion Animation  */
    let sun = gsap.timeline();
    ScrollTrigger.create({
        animation: sun,
        trigger: ".scrollElement",
        start: "top top",
        end: "2200 100%",
        scrub: 1,
    });

//sun motion 
    sun.to("#bg_grad", { attr: { cy: "330" } }, 0.00)

//bg change
    sun.to("#sun", { attr: { offset: "0.15" } }, 0.00)
    sun.to("#bg_grad stop:nth-child(2)", { attr: { offset: "0.15" } }, 0.00)
    sun.to("#bg_grad stop:nth-child(3)", { attr: { offset: "0.18" } }, 0.00)
    sun.to("#bg_grad stop:nth-child(4)", { attr: { offset: "0.25" } }, 0.00)
    sun.to("#bg_grad stop:nth-child(5)", { attr: { offset: "0.46" } }, 0.00)
    sun.to("#bg_grad stop:nth-child(6)", { attr: { "stop-color": "#FF9171" } }, 0)

/*   SCENE 2  */
    let scene2 = gsap.timeline();
    ScrollTrigger.create({
        animation: scene2,
        trigger: ".scrollElement",
        start: "15% top",
        end: "40% 100%",
        scrub: 4,
    });

scene2.fromTo("#h2-1", { y: 500, opacity: 0 }, { y: 0, opacity: 1 }, 0)
    scene2.fromTo("#h2-2", { y: 500 }, { y: 0 }, 0.1)
    scene2.fromTo("#h2-3", { y: 700 }, { y: 0 }, 0.1)
    scene2.fromTo("#h2-4", { y: 700 }, { y: 0 }, 0.2)
    scene2.fromTo("#h2-5", { y: 800 }, { y: 0 }, 0.3)
    scene2.fromTo("#h2-6", { y: 900 }, { y: 0 }, 0.3)

/* Bats */
    gsap.fromTo("#bats", { opacity: 1, y: 400, scale: 0 }, {
        y: 120,
        scale: 0.8,
        transformOrigin: "50% 50%",
        ease: "power3.out",
        scrollTrigger: {
            trigger: ".scrollElement",
            start: "40% top",
            end: "70% 100%",
            scrub: 3,
            onEnter: function() {
                gsap.utils.toArray("#bats path").forEach((item, i) => {
                    gsap.to(item, { scaleX: 0.5, yoyo: true, repeat: 11, duration: 0.15, delay: 0.7 + (i / 10), transformOrigin: "50% 50%" })
                });
                gsap.set("#bats", { opacity: 1 })
            },
            onLeave: function() { gsap.to("#bats", { opacity: 0, delay: 2 }) },
        }
    })

/* Sun increase */
    let sun2 = gsap.timeline();
    ScrollTrigger.create({
        animation: sun2,
        trigger: ".scrollElement",
        start: "2200 top",
        end: "5000 100%",
        scrub: 1,
    });

sun2.to("#sun", { attr: { offset: "0.6" } }, 0)
    sun2.to("#bg_grad stop:nth-child(2)", { attr: { offset: "0.7" } }, 0)
    sun2.to("#sun", { attr: { "stop-color": "#ffff00" } }, 0)
    sun2.to("#lg4 stop:nth-child(1)", { attr: { "stop-color": "#623951" } }, 0)
    sun2.to("#lg4 stop:nth-child(2)", { attr: { "stop-color": "#261F36" } }, 0)
    sun2.to("#bg_grad stop:nth-child(6)", { attr: { "stop-color": "#45224A" } }, 0)

/* Transition (from Scene2 to Scene3) */
    gsap.set("#scene3", { y: 580, visibility: "visible" })
    let sceneTransition = gsap.timeline();
    ScrollTrigger.create({
        animation: sceneTransition,
        trigger: ".scrollElement",
        start: "70% top",
        end: "bottom 100%",
        scrub: 3,
    });

sceneTransition.to("#h2-1", { y: -680, scale: 1.5, transformOrigin: "50% 50%" }, 0)
    sceneTransition.to("#bg_grad", { attr: { cy: "-80" } }, 0.00)
    sceneTransition.to("#bg2", { y: 0 }, 0)

/* Scene 3 */
    let scene3 = gsap.timeline();
    ScrollTrigger.create({
        animation: scene3,
        trigger: ".scrollElement",
        start: "80% 50%",
        end: "bottom 100%",
        scrub: 3,
    });

//Hills motion
    scene3.fromTo("#h3-1", { y: 300 }, { y: -550 }, 0)
    scene3.fromTo("#h3-2", { y: 800 }, { y: -550 }, 0.03)
    scene3.fromTo("#h3-3", { y: 600 }, { y: -550 }, 0.06)
    scene3.fromTo("#h3-4", { y: 800 }, { y: -550 }, 0.09)
    scene3.fromTo("#h3-5", { y: 1000 }, { y: -550 }, 0.12)

//stars
    scene3.fromTo("#stars", { opacity: 0 }, { opacity: 0.5, y: -500 }, 0)

// Scroll Back text
    scene3.fromTo("#arrow2", { opacity: 0 }, { opacity: 0.7, y: -710 }, 0.25)
    scene3.fromTo("#text2", { opacity: 0 }, { opacity: 0.7, y: -710 }, 0.3)

//gradient value change
    scene3.to("#bg2-grad", { attr: { cy: 600 } }, 0)
    scene3.to("#bg2-grad", { attr: { r: 500 } }, 0)

/*   falling star   */
    gsap.to("#fstar", {
        x: -700,
        y: -250,
        ease: "power4.out",
        scrollTrigger: {
            trigger: ".scrollElement",
            start: "4000 top",
            end: "6000 100%",
            scrub: 5,
            onEnter: function() { gsap.set("#fstar", { opacity: 1 }) },
            onLeave: function() { gsap.set("#fstar", { opacity: 0 }) },
        }
    })

//reset scrollbar position after refresh
    window.onbeforeunload = function() {
        window.scrollTo(0, 0);
    }

let fullscreen;
let fsEnter = document.getElementById('fullscr');
fsEnter.addEventListener('click', function (e) {
    e.preventDefault();
    if (!fullscreen) {
        fullscreen = true;
        document.documentElement.requestFullscreen();
        fsEnter.innerHTML = "Exit Fullscreen";
    }
    else {
        fullscreen = false;
        document.exitFullscreen();
        fsEnter.innerHTML = "Go Fullscreen";
    }
});