diff --git a/apps/web/src/components/chat/MessagesTimeline.tsx b/apps/web/src/components/chat/MessagesTimeline.tsx
index e3cfd4f13128d32c84f116abec5d842bcf2eafdf..2ae24a8c130c634402c4a84306eb1f613e78340f 100644
--- a/apps/web/src/components/chat/MessagesTimeline.tsx
+++ b/apps/web/src/components/chat/MessagesTimeline.tsx
@@ -698,7 +698,7 @@ function AssistantChangedFilesSectionInner({
 
   return (
     <div className="mt-2 rounded-lg border border-border/80 bg-card/45 p-2.5">
-      <div className="sticky top-2 z-10 mb-1.5 flex items-center justify-between gap-2 bg-background before:absolute before:inset-x-0 before:-top-2 before:h-2 before:bg-background before:content-['']">
+      <div className="sticky top-2 z-10 mb-1.5 flex items-center justify-between gap-2 bg-[color-mix(in_srgb,var(--card)_45%,var(--background))] before:absolute before:inset-x-0 before:-top-2 before:h-2 before:bg-[color-mix(in_srgb,var(--card)_45%,var(--background))] before:content-['']">
         <p className="text-[10px] uppercase tracking-[0.12em] text-muted-foreground/65">
           <span>Changed files ({changedFileCountLabel})</span>
           {hasNonZeroStat(summaryStat) && (