diff --git a/IPython/html/static/tree/less/tree.less b/IPython/html/static/tree/less/tree.less
index 01c8c89..b936c02 100644
--- a/IPython/html/static/tree/less/tree.less
+++ b/IPython/html/static/tree/less/tree.less
@@ -205,6 +205,10 @@ ul#new-menu {
 
                     .list_item {
                         border-bottom: 1px solid #ddd;
+
+                        &:last-child {
+                            border-bottom: 0px;
+                        }
                     }
                 }
             }