diff --git a/src/i18n/en-US/index.ts b/src/i18n/en-US/index.ts
index 6a08ac0..deee376 100644
--- a/src/i18n/en-US/index.ts
+++ b/src/i18n/en-US/index.ts
@@ -197,4 +197,5 @@ export default {
   usb7: "usb7",
   usb8: "usb8",
   usb9: "usb9",
+  "device standby mode": "Device Standby Mode",
 };
diff --git a/src/layouts/MainLayout.vue b/src/layouts/MainLayout.vue
index b5c81d8..4615811 100644
--- a/src/layouts/MainLayout.vue
+++ b/src/layouts/MainLayout.vue
@@ -13,8 +13,8 @@
       <!-- page -->
       <div
         v-if="!$store.state.power_state"
-        class="fit text-h5"
-        style="position: fixed; top: 50vh; left: 50vw"
+        class="fit text-h5 text-center"
+        style="position: fixed; top: 49.5vh"
       >
         {{ $t("device standby mode") }}
       </div>
diff --git a/src/pad/ContentWall.vue b/src/pad/ContentWall.vue
index d816b87..4e49afe 100644
--- a/src/pad/ContentWall.vue
+++ b/src/pad/ContentWall.vue
@@ -8,7 +8,7 @@
       style="position: absolute"
       class="full-width text-center"
     >
-      <span class="text-h5" style="z-index: 999; background: white">
+      <span class="text-h5 text-center" style="z-index: 999; background: white">
         {{ $t("device standby mode") }}
       </span>
     </div>