diff --git a/B05_wf2_Route/B05_wf2_Route_UI_IrregularStations.ts b/B05_wf2_Route/B05_wf2_Route_UI_IrregularStations.ts
index 8a35b54b..8f076d46 100644
--- a/B05_wf2_Route/B05_wf2_Route_UI_IrregularStations.ts
+++ b/B05_wf2_Route/B05_wf2_Route_UI_IrregularStations.ts
@@ -156,7 +156,8 @@ export function createIrregularStationsSection(
   callbacks: IrregularStationsCallbacks,
 ): IrregularStationsSection {
   const root = document.createElement("section");
-  root.className = "b05-route__panel-section ui-collapsible";
+  // ui-sidebar-section: 사이드 컨테이너 공통 외곽선(진하게, 2026-08-05 사용자 지시).
+  root.className = "b05-route__panel-section ui-collapsible ui-sidebar-section";
   const heading = document.createElement("h3");
   heading.className = "ui-collapsible__title";
   heading.textContent = "구조물 배치";