diff --git a/docs/custom.css b/docs/custom.css
index b3ce80f..d7e575b 100644
--- a/docs/custom.css
+++ b/docs/custom.css
@@ -2,6 +2,6 @@ p{
   font-size: 18px;
 }
 
-.toctree-l1{
+.wy-menu-vertical a{
   font-size:18px;
 }