diff --git a/app/assets/stylesheets/highlight/solarized_dark.scss b/app/assets/stylesheets/highlight/solarized_dark.scss
index ae7ecc65c39c630bff622a44e3ba8829f847910b..b0aaadd0f7f10325fa33a64e1922695e66efe85b 100644
--- a/app/assets/stylesheets/highlight/solarized_dark.scss
+++ b/app/assets/stylesheets/highlight/solarized_dark.scss
@@ -26,7 +26,7 @@
     }
 
     .diff-line-num.old, .line_content.old {
-      @include diff_background(rgba(220, 50, 47, 0.2), rgba(220, 50, 47, 0.3), #808080);
+      @include diff_background(rgba(220, 50, 47, 0.3), rgba(220, 50, 47, 0.3), #808080);
     }
 
     .line_content.match {