diff --git a/html/content.css b/html/content.css
index a6c012a..1b3eda8 100644
--- a/html/content.css
+++ b/html/content.css
@@ -110,3 +110,7 @@ figure > img:only-child, div > img:only-child, p > img:only-child {
     margin: 1em auto;
     float: none !important;
 }
+
+pre {
+    overflow: auto;
+}