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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="images">
  <div class="images__inner">
      <div class="images__flex">
          <div class="images__grid">
              <img src="https://picsum.photos/200/500" alt="">
              <img src="https://picsum.photos/300/300" alt="">
              <img src="https://picsum.photos/300/200" alt="">
              <img src="https://picsum.photos/500/500" alt="">
              <img src="https://picsum.photos/200/200" alt="">
              <img src="https://picsum.photos/200/300" alt="">
          </div>
          <div class="images__grid">
              <img src="https://picsum.photos/200/500" alt="">
              <img src="https://picsum.photos/300/300" alt="">
              <img src="https://picsum.photos/300/200" alt="">
              <img src="https://picsum.photos/500/500" alt="">
              <img src="https://picsum.photos/200/200" alt="">
              <img src="https://picsum.photos/200/300" alt="">
          </div>
      </div>
  </div>
</div>
!

CSS 

              
                *{
    padding: 0;
    margin: 0;
}
.images{
    width: 100%;
    padding: 100vh 0 100vh;
    overflow: hidden;// 画像たちがはみ出た分を非表示
    &__inner{
        width: fit-content;
    }
    &__flex{
        width: fit-content;
        display: flex;
    }
    &__grid{
        width: fit-content;
        margin: 0 auto;
        display: grid;
        gap: 20px;
        grid-template-columns: 200px 300px 500px 200px;
        grid-template-rows: 200px 100px 200px;
        padding: 0 10px;
        img{
            display: block;
            border-radius: 20px;
            overflow: hidden;
            width: 100%;
            height: 100%;
        }
        img:nth-of-type(1){
            grid-column: 1/2;
            grid-row: 1/4;
        }
        img:nth-of-type(2){
            grid-column: 2/3;
            grid-row: 1/3;
        }
        img:nth-of-type(3){
            grid-column: 2/3;
            grid-row: 3/4;
        }
        img:nth-of-type(4){
            grid-column: 3/4;
            grid-row: 1/4;
        }
        img:nth-of-type(5){
            grid-column: 4/5;
            grid-row: 1/2;
        }
        img:nth-of-type(6){
            grid-column: 4/5;
            grid-row: 2/4;
        }
    }
}
!

JS 

              
                /* 透明な状態から大きさを変えながら出現*/
gsap.fromTo('.images__grid img',{autoAlpha:0,scale:.7},{autoAlpha:1,scale:1,scrollTrigger:{
    trigger:'.images__flex',
    start:'top center',
    toggleActions:'play none none reverse'
}});
/* トリガー位置に到達したら画像を囲む要素が元の位置に戻る */
gsap.fromTo('.images__flex',{x:200},{x:0,scrollTrigger:{
    trigger:'.images__flex',
    start:'top center',
    toggleActions:'play none none reverse'
}});
/* スクロールに応じて画像を囲む要素が左に移動 */
gsap.to('.images__inner',{x:-200,scrollTrigger:{
    trigger:'.images__flex',
    start:'top center',
    scrub:true,
    markers:true,
}});
!
999px

Console