diff --git a/theme-arc-blue.css b/theme-arc-blue.css
index 3e937b8..fa562a6 100644
--- a/theme-arc-blue.css
+++ b/theme-arc-blue.css
@@ -879,6 +879,15 @@
       background-color: #121232 !important;
       border-color: #2d2d2d !important;
   }
+  .repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(1),
+  .repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(2),
+  .repository .diff-file-box .code-diff-split tbody tr.add-code td:nth-child(3),
+  .repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(4),
+  .repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(5),
+  .repository .diff-file-box .code-diff-split tbody tr.del-code td:nth-child(6) {
+      background-color: #151515;
+}
+
   .ui.blue.button,
   .ui.blue.buttons .button {
       color: #ddd;