diff --git a/themes/mytheme/assets/css/common/main.css b/themes/mytheme/assets/css/common/main.css
index 9a6bf73..f9ff596 100644
--- a/themes/mytheme/assets/css/common/main.css
+++ b/themes/mytheme/assets/css/common/main.css
@@ -4,6 +4,7 @@
     max-width: calc(var(--main-width) + var(--gap) * 2);
     margin: auto;
     padding: var(--gap);
+    overflow: hidden;
 }
 
 .page-header h1 {
@@ -78,4 +79,4 @@ pre:hover .copy-code {
     font-weight: bold;
     margin: 32px 4px 36px 4px;
     text-align: center;
-}
\ No newline at end of file
+}