diff --git a/src/client/theme-default/styles/code.css b/src/client/theme-default/styles/code.css
index 22f6267b..adc2a221 100644
--- a/src/client/theme-default/styles/code.css
+++ b/src/client/theme-default/styles/code.css
@@ -20,6 +20,7 @@ div[class*='language-'] {
   position: relative;
   margin: 1rem -1.5rem;
   background-color: var(--code-bg-color);
+  overflow-x: auto;
 }
 
 li > div[class*='language-'] {
diff --git a/src/client/theme-default/styles/layout.css b/src/client/theme-default/styles/layout.css
index a3169802..5038a14b 100644
--- a/src/client/theme-default/styles/layout.css
+++ b/src/client/theme-default/styles/layout.css
@@ -86,6 +86,7 @@ h2 {
   padding-bottom: .3rem;
   line-height: 1.25;
   font-size: 1.65rem;
+  overflow-x: auto;
 }
 
 h2 + h3 {