Make gain widget dB numbers smaller

src/alsa-scarlett-gui.css

@@ -65,6 +65,10 @@
   background: #801010;
 }
 
+label.gain {
+  font-size: smaller;
+}
+
 /* Default button style */
 .window-frame button {
   border: 1px solid #303030;

src/widget-gain.c

@@ -193,6 +193,7 @@ GtkWidget *make_gain_alsa_elem(
   gtk_dial_set_can_control(GTK_DIAL(data->dial), can_control);
 
   data->label = gtk_label_new(NULL);
+  gtk_widget_add_css_class(data->label, "gain");
   gtk_widget_set_vexpand(data->dial, TRUE);
 
   data->zero_is_off = zero_is_off;