diff --git a/libmalcontent-ui/malcontent-ui.gresource.xml b/libmalcontent-ui/malcontent-ui.gresource.xml
index cbdaa9f..089d8a5 100644
--- a/libmalcontent-ui/malcontent-ui.gresource.xml
+++ b/libmalcontent-ui/malcontent-ui.gresource.xml
@@ -4,6 +4,7 @@
   <gresource prefix="/org/freedesktop/MalcontentUi/ui">
     <file preprocess="xml-stripblanks">restrict-applications-dialog.ui</file>
     <file preprocess="xml-stripblanks">restrict-applications-selector.ui</file>
+    <file>restricts-switch.css</file>
     <file preprocess="xml-stripblanks">user-controls.ui</file>
   </gresource>
 </gresources>
diff --git a/libmalcontent-ui/restricts-switch.css b/libmalcontent-ui/restricts-switch.css
new file mode 100644
index 0000000..c44debe
--- /dev/null
+++ b/libmalcontent-ui/restricts-switch.css
@@ -0,0 +1,18 @@
+/* FIXME: This ‘negative’ variant of a GtkSwitch should probably be
+ * upstreamed to GTK. See https://gitlab.gnome.org/GNOME/gtk/issues/2470 */
+switch:checked.restricts {
+  background-color: @error_color;
+}
+
+switch:checked.restricts, switch:checked.restricts slider {
+  border-color: #8b0000;
+}
+
+switch:disabled.restricts {
+  border-color: @borders;
+  background-color: @insensitive_bg_color;
+}
+
+switch:disabled.restricts slider {
+  border-color: #bfb8b1;
+}
diff --git a/libmalcontent-ui/user-controls.c b/libmalcontent-ui/user-controls.c
index 080eb95..5326df4 100644
--- a/libmalcontent-ui/user-controls.c
+++ b/libmalcontent-ui/user-controls.c
@@ -949,12 +949,20 @@ mct_user_controls_init (MctUserControls *self)
 {
   g_autoptr(GDBusConnection) system_bus = NULL;
   g_autoptr(GError) error = NULL;
+  g_autoptr(GtkCssProvider) provider = NULL;
 
   /* Ensure the types used in the UI are registered. */
   g_type_ensure (MCT_TYPE_RESTRICT_APPLICATIONS_DIALOG);
 
   gtk_widget_init_template (GTK_WIDGET (self));
 
+  provider = gtk_css_provider_new ();
+  gtk_css_provider_load_from_resource (provider,
+                                       "/org/freedesktop/MalcontentUi/ui/restricts-switch.css");
+  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
+                                             GTK_STYLE_PROVIDER (provider),
+                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION - 1);
+
   self->selected_age = (guint) -1;
 
   self->cancellable = g_cancellable_new ();