diff --git a/layouts/partials/hb/modules/blog/post/toc.html b/layouts/partials/hb/modules/blog/post/toc.html
index 30e976a1..f07fbfd0 100644
--- a/layouts/partials/hb/modules/blog/post/toc.html
+++ b/layouts/partials/hb/modules/blog/post/toc.html
@@ -5,7 +5,7 @@
   <hr class="d-none d-md-block" />
   <div class="d-grid d-block d-md-none mb-2">
     <button
-      class="btn btn-light d-flex align-items-center justify-content-between collapsed"
+      class="btn btn-secondary d-flex align-items-center justify-content-between collapsed"
       type="button"
       data-bs-toggle="collapse"
       data-bs-target=".hb-blog-post-toc-collapse"