Index: frontend/node_modules/sanitize.css/system-ui.css
===================================================================
--- frontend/node_modules/sanitize.css/system-ui.css	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/sanitize.css/system-ui.css	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,27 @@
+/**
+ * Add the correct system-ui font-family in Firefox.
+ */
+
+@font-face {
+  font-family: system-ui;
+  src: local(".AppleSystemUIFont"), local("Segoe UI"), local("Ubuntu"), local("Roboto-Regular"), local("HelveticaNeue");
+}
+
+@font-face {
+  font-family: system-ui;
+  font-style: italic;
+  src: local(".AppleSystemUIFont"), local("Segoe UI Italic"), local("Ubuntu-Italic"), local("Roboto-Italic"), local("HelveticaNeue-Italic");
+}
+
+@font-face {
+  font-family: system-ui;
+  font-weight: bold;
+  src: local(".AppleSystemUIFont"), local("Segoe UI Bold"), local("Ubuntu-Bold"), local("Roboto-Bold"), local("HelveticaNeue-Bold");
+}
+
+@font-face {
+  font-family: system-ui;
+  font-style: italic;
+  font-weight: bold;
+  src: local(".AppleSystemUIFont"), local("Segoe UI Bold Italic"), local("Ubuntu-BoldItalic"), local("Roboto-BoldItalic"), local("HelveticaNeue-BoldItalic");
+}