diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 016a5d7781..574faa7372 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -3896,6 +3896,7 @@ a.account__display-name {
 }
 
 .scrollable {
+  container: column / inline-size;
   overflow-y: scroll;
   overflow-x: hidden;
   flex: 1 1 auto;
@@ -4577,6 +4578,7 @@ a.status-card {
 }
 
 .column-header__wrapper {
+  container: column / inline-size;
   position: relative;
   flex: 0 0 auto;
   z-index: 1;