Generate random grid in css

.wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    grid-gap: 10px;
    grid-auto-flow: dense;
    list-style: none;
    margin: 1em auto;
    padding: 0;
    max-width: 800px;
}
.wrapper li {
    border: 1px solid #ccc;
}
.wrapper li.landscape {
    grid-column-end: span 2;
}
.wrapper li img {
   display: block;
   object-fit: cover;
   width: 100%;
   height: 100%;
}

Source: developer.mozilla.org

Generate random grid in css

<ul class="wrapper">
   <li><img src="https://placehold.it/200x300" alt="placeholder"></li>
   <li class="landscape"><img src="https://placehold.it/350x200" alt="placeholder"></li>
   <li class="landscape"><img src="https://placehold.it/350x200" alt="placeholder"></li>
   <li class="landscape"><img src="https://placehold.it/350x200" alt="placeholder"></li>
   <li><img src="https://placehold.it/200x300" alt="placeholder"></li>
   <li><img src="https://placehold.it/200x300" alt="placeholder"></li>
   <li class="landscape"><img src="https://placehold.it/350x200" alt="placeholder"></li>
   <li><img src="https://placehold.it/200x300" alt="placeholder"></li>
   <li><img src="https://placehold.it/200x300" alt="placeholder"></li>
   <li><img src="https://placehold.it/200x300" alt="placeholder"></li>
</ul>

Source: developer.mozilla.org

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