diff --git themes/bartik/css/style.css themes/bartik/css/style.css
index 85563e5..0df0779 100644
--- themes/bartik/css/style.css
+++ themes/bartik/css/style.css
@@ -207,6 +207,14 @@ tr th {
   border-color: #555;
   border-color: rgba(255, 255, 255, 0.18);
 }
+tr.merge-down {
+  border-left: 1px solid #fff;
+  border-right: 1px solid #fff;
+}
+tr.merge-down td, tr.merge-down th {
+  border-left: none;
+  border-right: none;
+}
 tr.odd {
   background: #e4e4e4;
   background: rgba(0, 0, 0, 0.105);