diff --git a/packages/frontend/src/pages/welcome.entrance.simple.vue b/packages/frontend/src/pages/welcome.entrance.simple.vue
index c2a2420e50..edbd312249 100644
--- a/packages/frontend/src/pages/welcome.entrance.simple.vue
+++ b/packages/frontend/src/pages/welcome.entrance.simple.vue
@@ -34,7 +34,7 @@ import { instance as meta } from '@/instance.js';
 	position: fixed;
 	top: 0;
 	right: 0;
-	width: 80vw; // 100%からshapeの幅を引いている
+	width: 100vw;
 	height: 100vh;
 }