diff --git a/packages/backend/src/server/web/boot.js b/packages/backend/src/server/web/boot.js
index 3db288219..0c116450b 100644
--- a/packages/backend/src/server/web/boot.js
+++ b/packages/backend/src/server/web/boot.js
@@ -159,13 +159,16 @@
 			font-family: BIZ UDGothic, Roboto, HelveticaNeue, Arial, sans-serif;
 		}
 
+		.misskey_app {
+			display: none;
+		}
+
 		body,
 		html {
 			background-color: #222;
 			color: #dfddcc;
 			justify-content: center;
 			margin: auto;
-			width: 80%;
 			padding: 10px;
 			text-align: center;
 		}
diff --git a/packages/backend/src/server/web/views/flush.pug b/packages/backend/src/server/web/views/flush.pug
index a2256800d..7e0e77dc7 100644
--- a/packages/backend/src/server/web/views/flush.pug
+++ b/packages/backend/src/server/web/views/flush.pug
@@ -18,7 +18,6 @@ html
 				background-color: #222;
 				justify-content: center;
 				margin: auto;
-				width: 80%;
 				padding: 10px;
 				text-align: center;
 			}