diff --git a/website/static/css/custom.css b/website/static/css/custom.css
index 741acc1..f964b2b 100644
--- a/website/static/css/custom.css
+++ b/website/static/css/custom.css
@@ -44,3 +44,8 @@ footer.nav-footer {
   border-radius: 24px;
   min-width: 64px;
 }
+
+/* Navigation */
+.navGroup ul {
+  background-color: #f9f9f9;
+}