diff --git a/css/syntax.css b/css/syntax.css
index a3cc342..dbe7d9a 100644
--- a/css/syntax.css
+++ b/css/syntax.css
@@ -18,7 +18,7 @@ pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
 pre > code.sourceCode > span:empty { height: 1.2em; }
 code.sourceCode > span { color: inherit; text-decoration: inherit; }
 div.sourceCode { margin: 1em 0; }
-pre.sourceCode { margin: 0; }
+pre.sourceCode { margin: 0; overflow: auto; }
 @media screen {
 div.sourceCode { overflow: auto; }
 }