diff --git a/src/pretix/static/pretixpresale/scss/_iframe.scss b/src/pretix/static/pretixpresale/scss/_iframe.scss
index c240402c6..4b1a90596 100644
--- a/src/pretix/static/pretixpresale/scss/_iframe.scss
+++ b/src/pretix/static/pretixpresale/scss/_iframe.scss
@@ -3,6 +3,7 @@
 }
 .in-iframe .container {
   padding-top: 10px;
+  width: 100%;
 }
 .iframe-only,
 .in-iframe .iframe-hidden {