diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index b4b1228..1408447 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -49,6 +49,7 @@
     
     p:20_:where(pre)
     r:8_:where(pre)
+    overflow:auto_:where(pre)
     bg:gray-3_:where(pre,code:not(.highlight_*))
     p:2;4_:where(code:not(.highlight_*))
     r:4_:where(code:not(.highlight_*))