Make second-level subcategory titles smaller

style.css

@@ -396,6 +396,10 @@ body.dark .custom-header-static {
   font-size: 200%;
 }
 
+.custom-category-sub .custom-category-sub .custom-header {
+  font-size: 150%;
+}
+
 body.light .custom-header {
   color: #aaa;
   background-color: rgba(255, 255, 255, 0.3);