diff --git a/upload/themes/default/css/global.css b/upload/themes/default/css/global.css
index 67b52c1..1b4cdf1 100644
--- a/upload/themes/default/css/global.css
+++ b/upload/themes/default/css/global.css
@@ -720,6 +720,10 @@
 	color: #b97676;
 }
 
+.qxbb-iframe {
+	max-width: 100%;
+}
+
 .qxbb-left { text-align: left; }
 .qxbb-center { text-align: center; }
 .qxbb-right { text-align: right; }