diff --git a/source/css/_common/outline/sidebar/sidebar-nav.styl b/source/css/_common/outline/sidebar/sidebar-nav.styl
index 1f43ac9..eb70483 100644
--- a/source/css/_common/outline/sidebar/sidebar-nav.styl
+++ b/source/css/_common/outline/sidebar/sidebar-nav.styl
@@ -42,8 +42,12 @@
   overflow-y: auto;
 }
 
-.sidebar-toc-active .post-toc-wrap, .sidebar-overview-active .site-overview-wrap {
+.sidebar-overview-active .site-overview-wrap {
   // Flexbox layout makes it possible to reorder the child
   // elements of .site-overview-item through the `order` CSS property
   flex-column();
 }
+
+.sidebar-toc-active .post-toc-wrap {
+  display: block;
+}