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CSS

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HTML 

              
                 <section class="section-1">
      <h1 class="header-1">
        Header
      </h1>
      <div class="item-1">item 1
        <div class="item-description-1">
          item description 1
        </div>
      </div>
      <div class="item-2">item 2
        <div class="item-description-2">
          item description 2
        </div>
      </div>
      <div class="item-3">item 3
        <div class="item-description-3">
          item description 3
        </div>
      </div>
    </section>
    <section class="section-2">
      <h1 class="header-2">
        Header
      </h1>
      <p>content</p>
    </section>
    <section class="section-3">
      <h1 class="header-3">
        Header
      </h1>
      <p>content</p>
    </section>
!

CSS 

              
                 * {
        margin: 0;
        padding: 0;
      }

      section {
        width: 100vw;
        height: 100vh;
        position: relative;
        text-align: center;
      }

      .section-1 {
        background-color: lightsteelblue;
      }

      .section-2 {
        background-color: cadetblue;
      }

      .section-3 {
        background-color: lightcyan;
      }

      h1 {
        padding: 30px;
        font-size: 32px;
        text-transform: uppercase;
      }

      .header-1 {
        position: absolute;
        top: 33%;
        left: 33%;
      }

      .item-1,
      .item-2,
      .item-3 {
        background-color: grey;
        width: 20vh;
        height: 80vh;
        position: absolute;
        bottom: 0;
        left: -15vw;
      }

      .item-2 {
        left: 50vw;
      }

      .item-3,
      .item-4 {
        left: 100vw;
      }

      .item-description-1,
      .item-description-2,
      .item-description-3 {
        opacity: 0;
        background-color: #dbdbdb;
        padding: 10px;
        position: absolute;
        top: 50%;
        left: 33%;
      }
!

JS 

              
                
      gsap.registerPlugin(ScrollTrigger);

      const TL_intro = gsap.timeline({

        scrollTrigger: {
          trigger: '.header-1',
          start: 'top 20%',
          end: 'bottom 30%',
          scrub: 1,
          markers: true,
          pin: true
        }
      });
      TL_intro.to('.header-1', {
        autoAlpha: 0,
      })


      const TL_items = gsap.timeline({
        scrollTrigger: {
          trigger: ".section-1",
          scrub: 1,
          start: "top top",
          end: "+=300%",
          markers: true,
          pin: true,
        }
      });

      TL_items.to('.item-2', {
        x: '23vw', //slide in from left - out of view into view
        onComplete: () => {
          gsap.to('.item-description-1', {
            autoAlpha: 0
          })
        }
      })
        .to(".item-1", {
          x: '55vw', // slide to the right of screen - but not out of view
          ease: "power2",
          onComplete: () => {
            gsap.to('.item-description-1', {
              autoAlpha: 1 // fade in description when centre stage
            })
          }
        })
        .to('.item-2', {
          x: '0vw', // slide to centre
          onComplete: () => {
            gsap.to('.item-description-2', {
              autoAlpha: 1 // fade in description when centre stage
            })
          }
        })
        .to(".item-1", {
          x: '0vw', // slide to the right of screen
          ease: "power2",
          onUpdate: () => {
            gsap.to('.item-description-1', {
              autoAlpha: 0 // fade out description when not centre stage
            })
          }
        })
        .to('.item-2', {
          x: '-43vw', // slide to centre
          onUpdate: () => {
            gsap.to('.item-description-2', {
              autoAlpha: 0 // fade out description when not centre stage
            })
          }
        })
        .to(".item-3", {
          x: '-55vw', // slide in from out of view 
          ease: "power2",
          onComplete: () => {
            gsap.to('.item-description-3', {
              autoAlpha: 1 // fade in description when centre stage
            })
          }
        })
        .to(".item-2", {
          x: '-75vw', // slide in from out of view 
          ease: "power2",

        })
        .to(".item-3", {
          x: '-75vw', // slide in from out of view 
          ease: "power2",
          onComplete: () => {
            gsap.to('.item-description-3', {
              autoAlpha: 1 // fade in description when centre stage
            })
          }
        })
        .to(".item-3", {
          x: '-175vw', // slide in from out of view 
          ease: "power2",
          onUpdate: () => {
            gsap.to('.item-description-3', {
              autoAlpha: 0 // fade out description when not centre stage
            })
          }
        })
!
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