diff --git a/source/css/_plugins/comments/utterances.styl b/source/css/_plugins/comments/utterances.styl
index 68f4123..903d446 100644
--- a/source/css/_plugins/comments/utterances.styl
+++ b/source/css/_plugins/comments/utterances.styl
@@ -1,3 +1,3 @@
 .cmt-body.utterances
   margin: 0 -4px
-  
+  width: 'calc(100% + %s)' % 8px