diff --git a/r4ds.scss b/r4ds.scss
index b4fe1e8..bed1393 100644
--- a/r4ds.scss
+++ b/r4ds.scss
@@ -8,6 +8,14 @@ $primary: #637238 !default;
   color: #637238;
 }
 
+div.sidebar-item-container .active {
+  font-weight: bold;
+}
+
+.sidebar nav[role=doc-toc] ul>li>a.active, .sidebar nav[role=doc-toc] ul>li>ul>li>a.active{
+  font-weight: bold;
+}
+
 img.quarto-cover-image {
   box-shadow: 0 .5rem 1rem rgba(0,0,0,.15);
 }