diff --git a/dist/css/custom.css b/dist/css/custom.css
index 17126ae5..1b5795e4 100644
--- a/dist/css/custom.css
+++ b/dist/css/custom.css
@@ -53,3 +53,9 @@
     width:100%;
     height:300px;
 }
+
+pre.unstyled {
+    border-width: 0;
+    background-color: transparent;
+    padding: 0;
+}