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CSS

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HTML 

              
                <svg class="d-none" xmlns="http://www.w3.org/2000/svg">
  <symbol id="enlarge" viewBox="0 0 16 16">
    <path d="M1.5 1a.5.5 0 0 0-.5.5v4a.5.5 0 0 1-1 0v-4A1.5 1.5 0 0 1 1.5 0h4a.5.5 0 0 1 0 1h-4zM10 .5a.5.5 0 0 1 .5-.5h4A1.5 1.5 0 0 1 16 1.5v4a.5.5 0 0 1-1 0v-4a.5.5 0 0 0-.5-.5h-4a.5.5 0 0 1-.5-.5zM.5 10a.5.5 0 0 1 .5.5v4a.5.5 0 0 0 .5.5h4a.5.5 0 0 1 0 1h-4A1.5 1.5 0 0 1 0 14.5v-4a.5.5 0 0 1 .5-.5zm15 0a.5.5 0 0 1 .5.5v4a1.5 1.5 0 0 1-1.5 1.5h-4a.5.5 0 0 1 0-1h4a.5.5 0 0 0 .5-.5v-4a.5.5 0 0 1 .5-.5z"/>
  </symbol>
  <symbol id="exit" viewBox="0 0 16 16">
    <path d="M5.5 0a.5.5 0 0 1 .5.5v4A1.5 1.5 0 0 1 4.5 6h-4a.5.5 0 0 1 0-1h4a.5.5 0 0 0 .5-.5v-4a.5.5 0 0 1 .5-.5zm5 0a.5.5 0 0 1 .5.5v4a.5.5 0 0 0 .5.5h4a.5.5 0 0 1 0 1h-4A1.5 1.5 0 0 1 10 4.5v-4a.5.5 0 0 1 .5-.5zM0 10.5a.5.5 0 0 1 .5-.5h4A1.5 1.5 0 0 1 6 11.5v4a.5.5 0 0 1-1 0v-4a.5.5 0 0 0-.5-.5h-4a.5.5 0 0 1-.5-.5zm10 1a1.5 1.5 0 0 1 1.5-1.5h4a.5.5 0 0 1 0 1h-4a.5.5 0 0 0-.5.5v4a.5.5 0 0 1-1 0v-4z"/>
  </symbol>
</svg>

<h1 class="text-center mb-0">Bootstrap 5 Lightbox Gallery</h1>
<p class="text-center mb-4">Click an image to reveal the lightbox</p>

<section class="photo-gallery">
  <div class="container">
    <div class="row row-cols-1 row-cols-md-2 row-cols-lg-3 g-4 gallery-grid">
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/251/1200/800.webp">
          <img src="https://picsum.photos/id/251/480/320.webp" class="img-fluid" alt="Lorem ipsum dolor sit amet">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/678/1200/800.webp">
          <img src="https://picsum.photos/id/678/480/320.webp" class="img-fluid" alt="Ipsum lorem dolor sit amet">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/74/1200/800.webp">
          <img src="https://picsum.photos/id/74/480/320.webp" class="img-fluid" alt="Dolor lorem ipsum sit amet">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/92/1200/800.webp">
          <img src="https://picsum.photos/id/92/480/320.webp" class="img-fluid" alt="Sit amet lorem ipsum dolor">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/62/1200/800.webp">
          <img src="https://picsum.photos/id/62/480/320.webp" class="img-fluid" alt="Aut ipsam deserunt nostrum quo">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/575/1200/800.webp">
          <img src="https://picsum.photos/id/575/480/320.webp" class="img-fluid" alt="Nulla ex nihil eligendi tempora">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/110/1200/800.webp">
          <img src="https://picsum.photos/id/110/480/320.webp" class="img-fluid" alt="Nemo perspiciatis voluptatum">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/177/1200/800.webp">
          <img src="https://picsum.photos/id/177/480/320.webp" class="img-fluid" alt="Accusantium consequuntur modi">
        </a>
      </div>
      <div class="col">
        <a class="gallery-item" href="https://picsum.photos/id/197/1200/800.webp">
          <img src="https://picsum.photos/id/197/480/320.webp" class="img-fluid" alt="Dolore asperiores reprehenderit">
        </a>
      </div>
    </div>
  </div>
</section>

<footer id="copyright" class="mt-5 text-center">
  <div class="container">
    <div class="row">
      <div class="col">
        <p class="mb-0">With <b>Bootstrap 5.3.3</b> and <b>Vanilla JS</b></p>
        <p class="mb-0">Photos source: <a target="_blank" href="https://picsum.photos">Picsum photos</a></p>
        <p class="mb-0">Code made by <a target="_blank" href="https://adorade.ro">Adorade</a>. License <b>MIT</b></p>
      </div>
    </div>
  </div>
</footer>

<div class="modal fade lightbox-modal" id="lightbox-modal" tabindex="-1">
  <div class="modal-dialog modal-dialog-centered modal-fullscreen">
    <div class="modal-content">
      <button type="button" class="btn-fullscreen-enlarge" aria-label="Enlarge fullscreen">
        <svg class="bi"><use href="#enlarge"></use></svg>
      </button>
      <button type="button" class="btn-fullscreen-exit d-none" aria-label="Exit fullscreen">
        <svg class="bi"><use href="#exit"></use></svg>
      </button>
      <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      <div class="modal-body">
        <div class="lightbox-content">
          <!-- JS content here -->
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                :root {
  --lightbox: rgb(0 0 0 / 0.75);
  --carousel-text: #fff;
}

body {
  margin: 1.5rem 0 3.5rem;
}

@keyframes zoomin {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.gallery-item {
  display: block;
}

.gallery-item img {
  box-shadow: 0 1rem 1rem rgba(0, 0, 0, 0.15);
  transition: box-shadow 0.2s;
}

.gallery-item:hover img {
  box-shadow: 0 1rem 1rem rgba(0, 0, 0, 0.35);
}

.lightbox-modal .modal-content {
  background-color: var(--lightbox);
}

.lightbox-modal .btn-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-size: 1.25rem;
  z-index: 10;
  filter: invert(1) grayscale(100);
}

.lightbox-modal .modal-body {
  display: flex;
  align-items: center;
  padding: 0;
}

.lightbox-modal .lightbox-content {
  width: 100%;
}

.lightbox-modal .carousel-indicators {
  margin-bottom: 0;
}

.lightbox-modal .carousel-indicators [data-bs-target] {
  background-color: var(--carousel-text) !important;
}

.lightbox-modal .carousel-inner {
  width: 75%;
}

.lightbox-modal .carousel-inner img {
  animation: zoomin 10s linear infinite;
}

.lightbox-modal .carousel-item .carousel-caption {
  right: 0;
  bottom: 0;
  left: 0;
  padding-bottom: 2rem;
  background-color: var(--lightbox);
  color: var(--carousel-text) !important;
}

.lightbox-modal .carousel-control-prev,
.lightbox-modal .carousel-control-next {
  width: auto;
}

.lightbox-modal .carousel-control-prev {
  left: 1.25rem;
}

.lightbox-modal .carousel-control-next {
  right: 1.25rem;
}

@media (min-width: 1400px) {
  .lightbox-modal .carousel-inner {
    max-width: 60%;
  }
}

[data-bs-theme = "dark"] .lightbox-modal .carousel-control-next-icon,
[data-bs-theme = "dark"] .lightbox-modal .carousel-control-prev-icon {
    filter: none;
}

.btn-fullscreen-enlarge,
.btn-fullscreen-exit {
  position: absolute;
  top: 1.25rem;
  right: 3.5rem;
  z-index: 10;
  border: 0;
  background: transparent;
  opacity: .6;
  font-size: 1.25rem;
}

.bi {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: -0.035em;
  fill: currentcolor;
}
!

JS 

              
                const html = document.querySelector('html');
html.setAttribute('data-bs-theme', 'dark');

document.addEventListener('DOMContentLoaded', () => {
  // --- Create LightBox
  const galleryGrid = document.querySelector(".gallery-grid");
  const links = galleryGrid.querySelectorAll("a");
  const imgs = galleryGrid.querySelectorAll("img");
  const lightboxModal = document.getElementById("lightbox-modal");
  const bsModal = new bootstrap.Modal(lightboxModal);
  const modalBody = lightboxModal.querySelector(".lightbox-content");

  function createCaption (caption) {
    return `<div class="carousel-caption d-none d-md-block">
        <h4 class="m-0">${caption}</h4>
      </div>`;
  }

  function createIndicators (img) {
    let markup = "", i, len;

    const countSlides = links.length;
    const parentCol = img.closest('.col');
    const curIndex = [...parentCol.parentElement.children].indexOf(parentCol);

    for (i = 0, len = countSlides; i < len; i++) {
      markup += `
        <button type="button" data-bs-target="#lightboxCarousel"
          data-bs-slide-to="${i}"
          ${i === curIndex ? 'class="active" aria-current="true"' : ''}
          aria-label="Slide ${i + 1}">
        </button>`;
    }

    return markup;
  }

  function createSlides (img) {
    let markup = "";
    const currentImgSrc = img.closest('.gallery-item').getAttribute("href");

    for (const img of imgs) {
      const imgSrc = img.closest('.gallery-item').getAttribute("href");
      const imgAlt = img.getAttribute("alt");

      markup += `
        <div class="carousel-item${currentImgSrc === imgSrc ? " active" : ""}">
          <img class="d-block img-fluid w-100" src=${imgSrc} alt="${imgAlt}">
          ${imgAlt ? createCaption(imgAlt) : ""}
        </div>`;
    }

    return markup;
  }

  function createCarousel (img) {
    const markup = `
      <!-- Lightbox Carousel -->
      <div id="lightboxCarousel" class="carousel slide carousel-fade" data-bs-ride="true">
        <!-- Indicators/dots -->
        <div class="carousel-indicators">
          ${createIndicators(img)}
        </div>
        <!-- Wrapper for Slides -->
        <div class="carousel-inner justify-content-center mx-auto">
          ${createSlides(img)}
        </div>
        <!-- Controls/icons -->
        <button class="carousel-control-prev" type="button" data-bs-target="#lightboxCarousel" data-bs-slide="prev">
          <span class="carousel-control-prev-icon" aria-hidden="true"></span>
          <span class="visually-hidden">Previous</span>
        </button>
        <button class="carousel-control-next" type="button" data-bs-target="#lightboxCarousel" data-bs-slide="next">
          <span class="carousel-control-next-icon" aria-hidden="true"></span>
          <span class="visually-hidden">Next</span>
        </button>
      </div>
      `;

    modalBody.innerHTML = markup;
  }

  for (const link of links) {
    link.addEventListener("click", function (e) {
      e.preventDefault();
      const currentImg = link.querySelector("img");
      const lightboxCarousel = document.getElementById("lightboxCarousel");

      if (lightboxCarousel) {
        const parentCol = link.closest('.col');
        const index = [...parentCol.parentElement.children].indexOf(parentCol);

        const bsCarousel = new bootstrap.Carousel(lightboxCarousel);
        bsCarousel.to(index);
      } else {
        createCarousel(currentImg);
      }

      bsModal.show();
    });
  }

  // --- Support Fullscreen
  const fsEnlarge = document.querySelector(".btn-fullscreen-enlarge");
  const fsExit = document.querySelector(".btn-fullscreen-exit");

  function enterFS () {
    lightboxModal.requestFullscreen().then({}).catch(err => {
      alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
    });
    fsEnlarge.classList.toggle("d-none");
    fsExit.classList.toggle("d-none");
  }

  function exitFS () {
    document.exitFullscreen();
    fsExit.classList.toggle("d-none");
    fsEnlarge.classList.toggle("d-none");
  }

  fsEnlarge.addEventListener("click", (e) => {
    e.preventDefault();
    enterFS();
  });

  fsExit.addEventListener("click", (e) => {
    e.preventDefault();
    exitFS();
  });
})
!
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