diff --git a/src/ace/theme/tm.css b/src/ace/theme/tm.css
index 2f7cdd73..be5ef74f 100644
--- a/src/ace/theme/tm.css
+++ b/src/ace/theme/tm.css
@@ -1,7 +1,7 @@
 .ace-tm .ace_editor {
   border: 2px solid rgb(159, 159, 159);
   font-family: "Menlo", "Monaco", "Courier New", "Courier", monospace;
-  font-size: 12px;  
+  font-size: 11px;  
 }
 
 .ace-tm .ace_editor.ace_focus {
@@ -12,8 +12,8 @@
   width: 50px;
   background: #e8e8e8;
   color: #333;
-  font-family: Menlo, Monaco, "Courier New";
-  font-size: 12px;
+  font-family: "Menlo", "Monaco", "Courier New", monospace;
+  font-size: 11px;
   overflow : hidden;
 }