use .gallery_overlay + add experimental progress dots

static/style.css

@@ -1179,9 +1179,10 @@ a.search_subreddit:hover {
 .gallery {
     display: flex;
     flex-flow: row nowrap;
+    align-items: center;
     overflow-x: auto;
     scroll-snap-type: x mandatory;
-    align-items: center;
+    overscroll-behavior-x: none;
     background: var(--background);
     transition: background 0.2s;
 }
@@ -1197,25 +1198,80 @@ a.search_subreddit:hover {
     margin: 0;
 }
 
-.gallery_length {
+.gallery_overlay {
+    flex: 1 0 100%;
+    height: 100%;
     position: sticky;
-    flex-shrink: 0;
-    align-self: start;
-    right: 2%;
-    top: 2%;
-    width: 6em;
-    padding: 10px 5px;
-    margin-left: calc(-6em - 5px*2);
-    text-align: center;
-    background-color: rgba(0, 0, 0, 0.8);
-    border-radius: 5px;
+    left: 0;
+    margin-left: -100%;
+    pointer-events: none;
+    display: flex;
+    justify-content: center;
     transition: opacity 0.2s;
 }
 
-.gallery_length:focus {
+.gallery:focus-within .gallery_overlay {
     opacity: 0;
 }
 
+.gallery:not(:focus-within) .gallery_overlay * {
+    pointer-events: auto;
+}
+
+.gallery_length {
+    position: absolute;
+    right: 10px;
+    top: 10px;
+    padding: 10px;
+    text-align: center;
+    background-color: rgba(0, 0, 0, 0.8);
+    border-radius: 5px;
+}
+
+@supports not (animation-timeline: scroll()) {
+    .gallery_progress {
+        display: none;
+    }
+}
+
+.gallery_progress {
+    position: absolute;
+    bottom: 10px;
+    padding: 10px;
+    background-color: rgba(0, 0, 0, 0.8);
+    border-radius: 20px;
+    display: flex;
+    gap: 10px;
+}
+
+.gallery_dot,
+.gallery_dot_indicator {
+    width: 10px;
+    height: 10px;
+    box-sizing: border-box;
+    border: 1px solid var(--text);
+    border-radius: 50%;
+}
+
+.gallery_dot_indicator {
+    background: var(--text);
+    position: absolute;
+    animation-name: galleryDotIndicatorScroll;
+    animation-timeline: scroll(inline nearest);
+    animation-timing-function: linear;
+}
+
+@keyframes galleryDotIndicatorScroll {
+    from {
+        left: 10px;
+    }
+
+    to {
+        left: calc(100% - 10px);
+        transform: translateX(-100%);
+    }
+}
+
 .gallery img {
     display: block;
     margin: auto;

templates/utils.html

@@ -136,6 +136,15 @@
 	{% endif %}
 	{% else if post.post_type == "gallery" %}
 	<div class="gallery">
+		<div class="gallery_overlay" title="Hide overlay">
+			<div class="gallery_length" tabindex="-1">gallery<br>({{ post.gallery.len() }} images)</div>
+			<div class="gallery_progress" tabindex="-1">
+				{% for _ in post.gallery %}
+				<div class="gallery_dot"></div>
+				{% endfor %}
+				<div class="gallery_dot_indicator"></div>
+			</div>
+		</div>
 		{% for image in post.gallery -%}
 		<figure>
 			<a href="{{ image.url }}" ><img loading="lazy" alt="Gallery image" src="{{ image.url }}"/></a>
@@ -149,7 +158,6 @@
 			</figcaption>
 		</figure>
 		{%- endfor %}
-		<div class="gallery_length" tabindex="-1">gallery<br>({{ post.gallery.len() }} images)</div>
 	</div>
 	{% else if post.post_type == "link" %}
 	<a id="post_url" href="{{ post.media.url }}" rel="nofollow">{{ post.media.url }}</a>