Photo: Fix number positioning and parallax effect

src/molecules/Photo.svelte

@@ -21,6 +21,9 @@
     const imgAlt = `${photo.name}, ${location.region}, ${location.country.name}`
     const photoHref = `/viewer/${location.country.slug}/${location.slug}/${photo.slug}`
 
+    // Photo index
+    const photoIndex = (index < 10 ? '0': '') + index
+
 
     /*
     ** Run code when mounted
@@ -69,9 +72,9 @@
             <time class="photo__date" datetime={formatDate(photo.date, 'DATETIME')}>
                 {formatDate(photo.date, 'FULL')}
             </time>
-            <span class="photo__number">
-                {(index < 10 ? '0': '') + index}
-            </span>
+            <div class="photo__number">
+                <span id="photo_number">{photoIndex}</span>
+            </div>
         </div>
     </div>
 </div>