diff --git a/B05_wf2_Route/B05_wf2_Route_UI_Page.ts b/B05_wf2_Route/B05_wf2_Route_UI_Page.ts
index e079d58f..b54b1eee 100644
--- a/B05_wf2_Route/B05_wf2_Route_UI_Page.ts
+++ b/B05_wf2_Route/B05_wf2_Route_UI_Page.ts
@@ -270,5 +270,6 @@ export async function renderB05Route(root: HTMLElement): Promise<void> {
     routes: WORKFLOW_STEP_ROUTES,
     onStepClick: (stepIndex) => goToWorkflowStage(activeProjectId, WORKFLOW_STEP_ROUTES[stepIndex]),
   });
+  layout.root.classList.add("b05-route-layout");
   root.replaceChildren(layout.root);
 }
diff --git a/B05_wf2_Route/B05_wf2_Route_UI_Style.css b/B05_wf2_Route/B05_wf2_Route_UI_Style.css
index 8146a94c..a88f8da6 100644
--- a/B05_wf2_Route/B05_wf2_Route_UI_Style.css
+++ b/B05_wf2_Route/B05_wf2_Route_UI_Style.css
@@ -1,8 +1,25 @@
+.b05-route-layout {
+  height: calc(100vh - var(--spacing-64));
+  height: calc(100dvh - var(--spacing-64));
+  min-height: 0;
+  overflow: hidden;
+}
+
+.b05-route-layout .ui-workflow-layout__body,
+.b05-route-layout .ui-workflow-layout__main {
+  height: 100%;
+  min-height: 0;
+}
+
+.b05-route-layout .ui-workflow-layout__main {
+  overflow: hidden;
+}
+
 .b05-route__viewport {
   position: relative;
   width: 100%;
   height: 100%;
-  min-height: 560px;
+  min-height: 0;
   overflow: hidden;
   background: var(--color-surface);
 }