diff --git a/webservice/app.ts b/webservice/app.ts
index b38f514..42d1459 100644
--- a/webservice/app.ts
+++ b/webservice/app.ts
@@ -30,7 +30,11 @@ app.use(express.json());
 app.use(express.urlencoded({extended: false}));
 app.use(cookieParser());
 app.use(cors());
-app.use(express.static(path.join(__dirname, 'public')));
+app.use(express.static(path.join(__dirname, 'public'), {
+	setHeaders: (res, path, stat) => {
+		res.setHeader('Supports-Loading-Mode', 'fenced-frame')
+	}
+}));
 
 // bot account setup: get siteinfo once and refresh tokens every 10 minutes
 // XXX: more systematic way for token handling?
diff --git a/webservice/public/images/tank-img.png b/webservice/public/images/tank-img.png
new file mode 100644
index 0000000..e0ab6d8
Binary files /dev/null and b/webservice/public/images/tank-img.png differ