diff --git a/pretalx_broadcast_tools/exporter.py b/pretalx_broadcast_tools/exporter.py
index 9d22788..f1e10d1 100644
--- a/pretalx_broadcast_tools/exporter.py
+++ b/pretalx_broadcast_tools/exporter.py
@@ -284,8 +284,7 @@ class PDFExporter(ScheduleData):
     show_qrcode = False
     icon = "fa-file-pdf"
 
-    def _add_pages(self, doc):
-        style = self._style()
+    def _add_pages(self):
         pages = []
         for fahrplan_day in self.data:
             for room_details in fahrplan_day["rooms"]:
@@ -302,12 +301,13 @@ class PDFExporter(ScheduleData):
                             fahrplan_day,
                             room_details,
                             talk,
-                            style,
+                            self._style,
                         )
                     )
                     pages.append(PageBreak())
         return pages
 
+    @property
     def _style(self):
         stylesheet = StyleSheet1()
         stylesheet.add(
@@ -366,7 +366,7 @@ class PDFExporter(ScheduleData):
                 topMargin=0,
                 bottomMargin=0,
             )
-            doc.build(self._add_pages(doc))
+            doc.build(self._add_pages())
             f.seek(0)
 
             return (
diff --git a/pretalx_broadcast_tools/management/commands/export_voctomix_lower_thirds.py b/pretalx_broadcast_tools/management/commands/export_voctomix_lower_thirds.py
index 50c84b3..c9ebe56 100644
--- a/pretalx_broadcast_tools/management/commands/export_voctomix_lower_thirds.py
+++ b/pretalx_broadcast_tools/management/commands/export_voctomix_lower_thirds.py
@@ -78,13 +78,15 @@ class VoctomixLowerThirdsExporter:
             encoding="unic",
         )
 
-    def _hex2rgb(self, hex_value):
+    @staticmethod
+    def _hex2rgb(hex_value):
         hex_value = hex_value.lstrip("#")
         # black insists this should have spaces around the :, but flake8
         # complains about spaces around the :, soooooo ....
         return tuple(int(hex_value[i : i + 2], 16) for i in (0, 2, 4))  # NOQA
 
-    def _fit_text(self, input_text, font, max_width):
+    @staticmethod
+    def _fit_text(input_text, font, max_width):
         words = [i.strip() for i in input_text.split()]
         lines = []
         line = []
@@ -177,7 +179,7 @@ class VoctomixLowerThirdsExporter:
         img.save(filename)
         self.log.debug(
             f"Generated single-speaker image for {speaker.get_display_name()!r} "
-            "of talk {talk.submission.title!r}, saved as {filename}"
+            f"of talk {talk.submission.title!r}, saved as {filename}"
         )
         return filename
 
diff --git a/pretalx_broadcast_tools/static/pretalx_broadcast_tools/frontend.css b/pretalx_broadcast_tools/static/pretalx_broadcast_tools/frontend.css
index 0df4ef0..650e93b 100644
--- a/pretalx_broadcast_tools/static/pretalx_broadcast_tools/frontend.css
+++ b/pretalx_broadcast_tools/static/pretalx_broadcast_tools/frontend.css
@@ -63,7 +63,7 @@ body {
     margin-left: -510px;
     padding: 15px;
 
-    box-shadow: 5px 5px 10px 0px rgba(50, 50, 50, 0.75);
+    box-shadow: 5px 5px 10px 0 rgba(50, 50, 50, 0.75);
     background-color: #3aa57c;
 }
 
diff --git a/pretalx_broadcast_tools/views/qr.py b/pretalx_broadcast_tools/views/qr.py
index ec55d65..e00c992 100644
--- a/pretalx_broadcast_tools/views/qr.py
+++ b/pretalx_broadcast_tools/views/qr.py
@@ -8,23 +8,23 @@ from django.utils.safestring import mark_safe
 from django.views import View
 
 
+def _make_svg_response(url):
+        image = qrcode.make(
+            url, image_factory=qrcode.image.svg.SvgImage
+        )
+        svg_data = mark_safe(ElementTree.tostring(image.get_image()).decode())
+        return HttpResponse(svg_data, content_type="image/svg+xml")
+
+
 class BroadcastToolsFeedbackQrCodeSvg(View):
     def get(self, request, *args, **kwargs):
         talk = self.request.event.submissions.filter(id=kwargs["talk"]).first()
         domain = request.event.custom_domain or settings.SITE_URL
-        image = qrcode.make(
-            f"{domain}{talk.urls.feedback}", image_factory=qrcode.image.svg.SvgImage
-        )
-        svg_data = mark_safe(ElementTree.tostring(image.get_image()).decode())
-        return HttpResponse(svg_data, content_type="image/svg+xml")
+        return _make_svg_response(f"{domain}{talk.urls.feedback}")
 
 
 class BroadcastToolsPublicQrCodeSvg(View):
     def get(self, request, *args, **kwargs):
         talk = self.request.event.submissions.filter(id=kwargs["talk"]).first()
         domain = request.event.custom_domain or settings.SITE_URL
-        image = qrcode.make(
-            f"{domain}{talk.urls.public}", image_factory=qrcode.image.svg.SvgImage
-        )
-        svg_data = mark_safe(ElementTree.tostring(image.get_image()).decode())
-        return HttpResponse(svg_data, content_type="image/svg+xml")
+        return _make_svg_response(f"{domain}{talk.urls.public}")