diff --git a/src/pretix/static/pretixpresale/js/ui/iframe.js b/src/pretix/static/pretixpresale/js/ui/iframe.js
index 33d9cc9da0..c7d0119e13 100644
--- a/src/pretix/static/pretixpresale/js/ui/iframe.js
+++ b/src/pretix/static/pretixpresale/js/ui/iframe.js
@@ -6,5 +6,5 @@ var inIframe = function () {
     }
 };
 if (inIframe()) {
-    document.body.classList.add('in-iframe');
+    document.documentElement.classList.add('in-iframe');
 }
diff --git a/src/pretix/static/pretixpresale/scss/_iframe.scss b/src/pretix/static/pretixpresale/scss/_iframe.scss
index 7ac1ecc555..65e04958bf 100644
--- a/src/pretix/static/pretixpresale/scss/_iframe.scss
+++ b/src/pretix/static/pretixpresale/scss/_iframe.scss
@@ -1,7 +1,7 @@
 .in-iframe .page-header, .in-iframe .page-header-links {
   display: none;
 }
-body.in-iframe {
+.in-iframe body {
   background: white !important;
 }
 .in-iframe .main-box {