diff --git a/notebook/static/notebook/less/cell.less b/notebook/static/notebook/less/cell.less
index 6aaaabfe4..0de7242b4 100644
--- a/notebook/static/notebook/less/cell.less
+++ b/notebook/static/notebook/less/cell.less
@@ -29,9 +29,10 @@ div.cell {
         border-left-color: @soft_select_color;
         border-left-width: @cell_border_width;
         padding-left: @cell_padding - @cell_border_width;
+        border-right-color: @soft_select_color;
+        border-right-width: @cell_border_width;
         background: @soft_select_color;
 
-
         @media print {
             border-color: transparent;
         }