<div class="container">
  <img loading="lazy" src="https://picsum.photos/seed/400/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/401/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/402/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/403/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/404/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/405/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/406/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/407/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/408/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/409/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/410/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/411/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/412/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/413/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/414/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/415/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/416/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/417/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/418/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/419/400/400" height="400" width="400" />
  <img loading="lazy" src="https://picsum.photos/seed/420/400/400" height="400" width="400" />
</div>
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

External CSS

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External JavaScript

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