diff --git a/src/main/webapp/app/reporting/report.zul b/src/main/webapp/app/reporting/report.zul
index 10ee9734..4689a966 100644
--- a/src/main/webapp/app/reporting/report.zul
+++ b/src/main/webapp/app/reporting/report.zul
@@ -18,8 +18,8 @@
 				onClick="@command('send')" />
 		</toolbar>
 		<iframe
-			width="100%"
-			height="100%"
+			vflex="1"
+			hflex="1"
 			src="/api/report.pdf" />
 	</window>
 </zk>
\ No newline at end of file