diff --git a/static/css/post-self.css b/static/css/post-self.css
index 4fc3d01..da01338 100644
--- a/static/css/post-self.css
+++ b/static/css/post-self.css
@@ -12,6 +12,17 @@ blockquote {
     overflow-wrap: break-word;
 }
 
+nav details summary::marker,
+:is(::-webkit-details-marker) {
+    content: "+ ";
+    font-family: monospace;
+    font-weight: bold;
+}
+
+nav details[open]:first-of-type summary::marker {
+    content: "− ";
+}
+
 main.story .author, main.story .character, main.story h3 {
     font-family: "Gotu", sans-serif !important;
     text-align: center !important;
diff --git a/themes/maddybook b/themes/maddybook
index c847f9b..612f216 160000
--- a/themes/maddybook
+++ b/themes/maddybook
@@ -1 +1 @@
-Subproject commit c847f9bdadd04b9d2a1b9dbe9fd5925b10727369
+Subproject commit 612f216384da493a817309f2130eebd1dd59fef6