diff --git a/packages/client/ui-chat/src/client/chat/ChatView.module.css b/packages/client/ui-chat/src/client/chat/ChatView.module.css
index d3428d9cc2..91cdfb7b75 100644
--- a/packages/client/ui-chat/src/client/chat/ChatView.module.css
+++ b/packages/client/ui-chat/src/client/chat/ChatView.module.css
@@ -4,6 +4,8 @@
   flex-direction: column;
   min-height: 0;
   flex: 1 1 auto;
+  /* Floating controls query this frame outside the clipped transcript. */
+  container-type: inline-size;
 }
 
 .root {