diff --git a/assets/syntax.scss b/assets/syntax.scss
index 27c37f4be..bada47ab5 100644
--- a/assets/syntax.scss
+++ b/assets/syntax.scss
@@ -1,4 +1,4 @@
-/* Background */ .chroma { color: #f8f8f2; background-color: #282a36 }
+/* Background */ .chroma { color: #f8f8f2; background-color: #282a36; overflow: hidden }
 /* Other */ .chroma .x {  }
 /* Error */ .chroma .err {  }
 /* LineTableTD */ .chroma .lntd { vertical-align: top; padding: 0; margin: 0; border: 0; }