diff --git a/static/css/theme.css b/static/css/theme.css
index c64a70ec1e..e63fa20d20 100644
--- a/static/css/theme.css
+++ b/static/css/theme.css
@@ -678,6 +678,7 @@ table {
 }
 th, thead td {
     background: #eaeaea;
+    border: 1px solid #ccc;
     -webkit-print-color-adjust: exact;
 	color-adjust: exact;
     padding: 0.5rem;