diff --git a/panel-plugin/pulseaudio-button.c b/panel-plugin/pulseaudio-button.c
index 5657107..bb27c3c 100644
--- a/panel-plugin/pulseaudio-button.c
+++ b/panel-plugin/pulseaudio-button.c
@@ -139,7 +139,7 @@ pulseaudio_button_init (PulseaudioButton *button)
 
   /* Setup Gtk style */
   css_provider = gtk_css_provider_new ();
-  gtk_css_provider_load_from_data (css_provider, ".xfce4-panel button { padding: 1px; }", -1, NULL);
+  gtk_css_provider_load_from_data (css_provider, ".xfce4-panel button { padding: 1px; background-color: transparent; }", -1, NULL);
   gtk_style_context_add_provider (GTK_STYLE_CONTEXT (gtk_widget_get_style_context (GTK_WIDGET (button))),
                                   GTK_STYLE_PROVIDER (css_provider),
                                   GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);