diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7236a17ce..1593ea648 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
   build:
 
     name: Python ${{ matrix.python-version }}, Django ${{ matrix.django-version }} (${{ matrix.variant }})
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     continue-on-error: ${{ matrix.experimental == 'true' }}
     strategy:
       matrix:
@@ -97,4 +97,4 @@ jobs:
         uses: pypa/gh-action-pypi-publish@v1.4.1
         with:
           user: __token__
-          password: ${{ secrets.PYPI_TOKEN }}
\ No newline at end of file
+          password: ${{ secrets.PYPI_TOKEN }}
diff --git a/two_factor/templates/two_factor/admin/setup.html b/two_factor/templates/two_factor/admin/setup.html
index ba83cf31c..3901dc937 100644
--- a/two_factor/templates/two_factor/admin/setup.html
+++ b/two_factor/templates/two_factor/admin/setup.html
@@ -20,7 +20,7 @@
         smartphone to scan the QR code below. For example, use Google
         Authenticator. Then, enter the token generated by the app.
         {% endblocktrans %}</p>
-    <p><img class="centered-image" src="{{ QR_URL }}" alt="QR Code" /></p>
+    <p><img class="centered-image" style="background-color: white" src="{{ QR_URL }}" alt="QR Code" /></p>
   {% elif wizard.steps.current == 'sms' %}
     <p>{% blocktrans trimmed %}Please enter the phone number you wish to receive the
       text messages on. This number will be validated in the next step.