diff --git a/static/trip.html b/static/trip.html
index 42fe95d..011702d 100644
--- a/static/trip.html
+++ b/static/trip.html
@@ -70,7 +70,7 @@
         #solver { margin-bottom: 0.75rem; }
         #solver-results { margin-top: 0.5rem; }
         .room-card { margin-bottom: 0.3rem; }
-        .room-locked::part(base) { border: 1px solid rgba(128, 128, 128, 0.2); }
+        .room-locked { --border-width: 1px; --border-color: var(--wa-color-brand-50); }
         .room-label { font-weight: bold; font-size: 0.8rem; margin-bottom: 0.2rem; }
         .solver-score { font-size: 0.8rem; margin-top: 0.3rem; color: var(--wa-color-neutral-500); }
         .divider { border: none; border-top: 1px solid #909090; margin: 0.75rem 0; }