diff --git a/services/web-ui/public/styles-playout.css b/services/web-ui/public/styles-playout.css
index 29116f8..d6a1757 100644
--- a/services/web-ui/public/styles-playout.css
+++ b/services/web-ui/public/styles-playout.css
@@ -63,7 +63,7 @@
 /* ── Top row: PGM + right rail ───────────────────────────────────────────────── */
 .po-top {
   display: grid;
-  grid-template-columns: 1fr 300px;
+  grid-template-columns: minmax(0, 960px) 300px;
   gap: 12px;
   align-items: start;
 }