Try out centered gray label

sass/_utils.scss

@@ -2,3 +2,13 @@
   width: 70%;
   height: 70%;
 }
+
+.caption {
+  display: flex;
+  justify-content: center;
+  padding: 4px 10px 4px 10px;
+}
+
+.tag.caption {
+  width: 100%;
+}

templates/blog/post.html

@@ -17,7 +17,9 @@
               <img src="{{ image.url }}" alt="{{ post.extra.depiction.alt }}" />
             </div>
             {% if post.extra.depiction.credits %}
-              <figcaption>{{ post.extra.depiction.credits }}</figcaption>
+            <div class="caption">
+              <figcaption class="tag is-rounded caption">{{ post.extra.depiction.credits }}</figcaption>
+            </div>
             {% endif %}
           </figure>
         </div>