diff --git a/customize.dist/src/less2/include/markdown.less b/customize.dist/src/less2/include/markdown.less
index c95f83645..a79717550 100644
--- a/customize.dist/src/less2/include/markdown.less
+++ b/customize.dist/src/less2/include/markdown.less
@@ -44,6 +44,13 @@
             text-overflow: ellipsis;
         }
     }
+
+    div.plain-text-reader {
+        background: #f3f3f3;
+        padding: 10px;
+        color: black;
+        text-align: left;
+    }
 }
 
 .markdown_preformatted-code (@color: #333) {