diff --git a/js&css/extension/www.youtube.com/styles.css b/js&css/extension/www.youtube.com/styles.css
index 4cb1af01e..2965d76f0 100644
--- a/js&css/extension/www.youtube.com/styles.css
+++ b/js&css/extension/www.youtube.com/styles.css
@@ -2342,4 +2342,13 @@ html[it-subscriptions-list-layout="true"][it-pathname="/feed/subscriptions"] ytd
 /* Hide empty items */
 html[it-subscriptions-list-layout="true"][it-pathname="/feed/subscriptions"] ytd-rich-item-renderer[is-empty] {
     display: none !important;
-}
\ No newline at end of file
+}
+/* Fix: expand video when chat replay is hidden */
+html[it-hide-chat-replay=true] #secondary {
+  display: none !important;
+}
+
+html[it-hide-chat-replay=true] #primary {
+  width: 100% !important;
+  max-width: 100% !important;
+}