diff --git a/lib/default-theme/styles/theme.styl b/lib/default-theme/styles/theme.styl
index e515037310..cefae34472 100644
--- a/lib/default-theme/styles/theme.styl
+++ b/lib/default-theme/styles/theme.styl
@@ -70,6 +70,8 @@ body
 .content.custom
   padding 0
   margin 0
+  img
+    max-width 100%
 
 a
   font-weight 500