diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 2aaaae5..9fd564c 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -58,7 +58,7 @@
       }
       table {
         border-collapse: collapse;
-        border-right: 1px solid #ddd;
+        border-right: 1px solid var(--border-color);
         table-layout: fixed;
       }
       .lineNum {