diff --git a/src/client/theme-default/styles/code.css b/src/client/theme-default/styles/code.css
index adc2a221..e27762ce 100644
--- a/src/client/theme-default/styles/code.css
+++ b/src/client/theme-default/styles/code.css
@@ -85,6 +85,7 @@ li > div[class*='language-'] {
   font-family: var(--code-font-family);
   font-size: var(--code-font-size);
   user-select: none;
+  overflow: hidden;
 }
 
 .highlight-lines .highlighted {