diff --git a/src/pretix/static/pretixpresale/js/widget/widget.js b/src/pretix/static/pretixpresale/js/widget/widget.js
index a1e6e6411..492842c19 100644
--- a/src/pretix/static/pretixpresale/js/widget/widget.js
+++ b/src/pretix/static/pretixpresale/js/widget/widget.js
@@ -1505,7 +1505,7 @@ var shared_root_computed = {
         return form_target
     },
     useIframe: function () {
-        return !this.disable_iframe && Math.min(screen.width, window.innerWidth) >= 800 && (this.skip_ssl || site_is_secure());
+        return !this.disable_iframe && (this.skip_ssl || site_is_secure());
     },
     showPrices: function () {
         var has_priced = false;
diff --git a/src/pretix/static/pretixpresale/scss/widget.scss b/src/pretix/static/pretixpresale/scss/widget.scss
index a88ea2e64..910c653ec 100644
--- a/src/pretix/static/pretixpresale/scss/widget.scss
+++ b/src/pretix/static/pretixpresale/scss/widget.scss
@@ -788,5 +788,30 @@
   }
 }
 
+@media (max-width: 800px) {
+  .pretix-widget-frame-holder .pretix-widget-frame-inner {
+    left: 0;
+    width: 100%;
+    height: 100%;
+    top: 0;
+    background: $brand-primary;
+    border-radius: 0;
+    -moz-border-radius: 0;
+    -webkit-border-radius: 0;
+    box-shadow: none;
+    -webkit-box-shadow: none;
+    -moz-box-shadow: none;
+    padding: 40px 0 0 0;
+  }
+  .pretix-widget-frame-holder .pretix-widget-frame-close {
+    right: 20px;
+    top: 20px;
+    background: white;
+    svg path {
+      fill: $brand-primary;
+    }
+  }
+}
+
 // https://github.com/Akryum/vue-resize/blob/master/dist/vue-resize.css
 .resize-observer[data-v-b329ee4c]{position:absolute;top:0;left:0;z-index:-1;width:100%;height:100%;border:none;background-color:transparent;pointer-events:none;display:block;overflow:hidden;opacity:0}.resize-observer[data-v-b329ee4c] object{display:block;position:absolute;top:0;left:0;height:100%;width:100%;overflow:hidden;pointer-events:none;z-index:-1}