Add styles for the gallery

site/snippets/blocks/gallery.php

@@ -0,0 +1,23 @@
+<?php
+/** @var \Kirby\Cms\Block $block */
+?>
+<figure class="gallery">
+  <ul>
+    <?php foreach ($block->images()->toFiles() as $image): ?>
+    <li>
+      <?php snippet('image', [
+        'alt'      => $image->alt(),
+        'contain'  => $block->crop()->isTrue(),
+        'lightbox' => true,
+        'ratio'    => $block->ratio()->or('auto'),
+        'src'      => $image->url(),
+      ]) ?>
+    </li>
+    <?php endforeach ?>
+  </ul>
+  <?php if ($block->caption()->isNotEmpty()): ?>
+  <figcaption>
+    <?= $block->caption() ?>
+  </figcaption>
+  <?php endif ?>
+</figure>