diff --git a/core/themes/seven/style.css b/core/themes/seven/style.css
index 72ce5e6..d836dbc 100644
--- a/core/themes/seven/style.css
+++ b/core/themes/seven/style.css
@@ -215,6 +215,7 @@ pre {
   font-size: 1.385em;
   font-weight: normal;
   float: left; /* LTR */
+  max-width: 89%;
 }
 
 /**