diff -r 000000000000 -r 6474c204b198 browser/devtools/sourceeditor/test/cm_mode_test.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/sourceeditor/test/cm_mode_test.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+.mt-output .mt-token {
+  border: 1px solid #ddd;
+  white-space: pre;
+  font-family: "Consolas", monospace;
+  text-align: center;
+}
+
+.mt-output .mt-style {
+  font-size: x-small;
+}