diff --git a/src/App.css b/src/App.css
index 07c248d..a9d3d41 100644
--- a/src/App.css
+++ b/src/App.css
@@ -83,7 +83,7 @@ li {
 
 @media (max-width: 640px) {
   #notebooks {
-    margin: 0px;
+    margin: 0;
   }
 
   #notebooks span {