diff --git a/kallithea/public/css/style.css b/kallithea/public/css/style.css
--- a/kallithea/public/css/style.css
+++ b/kallithea/public/css/style.css
@@ -4964,6 +4964,20 @@ table.code-difftable .code pre {
     white-space: pre-wrap;
 }
 
+table.code-difftable .del .code pre:before {
+    content: "-";
+    color: #550000;
+}
+ 
+table.code-difftable .add .code pre:before {
+    content: "+";
+    color: #005500;
+}
+ 
+table.code-difftable .unmod .code pre:before {
+    content: " ";
+}
+ 
 .add-bubble {
     position: relative;
     display: none;