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
@@ -4966,15 +4966,27 @@ table.code-difftable .code pre {
 table.code-difftable .del .code pre:before {
     content: "-";
     color: #550000;
+    float: left;
+    left: -1em;
+    position: relative;
+    width: 0;
 }
  
 table.code-difftable .add .code pre:before {
     content: "+";
     color: #005500;
+    float: left;
+    left: -1em;
+    position: relative;
+    width: 0;
 }
  
 table.code-difftable .unmod .code pre:before {
     content: " ";
+    float: left;
+    left: -1em;
+    position: relative;
+    width: 0;
 }
  
 .add-bubble {
@@ -4991,6 +5003,7 @@ tr.line.add:hover td .add-bubble,
 tr.line.del:hover td .add-bubble,
 tr.line.unmod:hover td .add-bubble {
     display: block;
+    z-index: 1;
 }
 
 .add-bubble div {