Ticket #61808: 61808.1.patch

src/wp-content/themes/twentytwelve/css/editor-blocks.css

@@ -268 +268 @@
 
 .wp-block-code {
         border: 0;
+        font-family: Consolas, Monaco, Lucida Console, monospace;
         font-size: 12px;
         line-height: 2;
         padding: 0;