diff --git a/src/process-statusbar.c b/src/process-statusbar.c
index 0299d26..c9e343f 100644
--- a/src/process-statusbar.c
+++ b/src/process-statusbar.c
@@ -133,7 +133,11 @@ xtm_process_statusbar_set_property (GObject *object, guint property_id, const GV
 	XtmProcessStatusbar *statusbar = XTM_PROCESS_STATUSBAR (object);
 	gchar *text;
 	gchar *float_value;
+#ifdef HAVE_GTK3
+	GdkRGBA color;
+#else
 	GdkColor color;
+#endif
 
 	switch (property_id)
 	{
@@ -142,8 +146,13 @@ xtm_process_statusbar_set_property (GObject *object, guint property_id, const GV
 		float_value = rounded_float_value (statusbar->cpu, statusbar->settings);
 		text = g_strdup_printf (_("CPU: %s%%"), float_value);
 		gtk_label_set_text (GTK_LABEL (statusbar->label_cpu), text);
+#ifdef HAVE_GTK3
+		gdk_rgba_parse (&color, "#ff6e00");
+		gtk_widget_override_color (statusbar->label_cpu, GTK_STATE_NORMAL, &color);
+#else
 		gdk_color_parse ("#ff6e00", &color);
 		gtk_widget_modify_fg (statusbar->label_cpu, GTK_STATE_NORMAL, &color);
+#endif
 		g_free (float_value);
 		g_free (text);
 		break;
@@ -152,8 +161,13 @@ xtm_process_statusbar_set_property (GObject *object, guint property_id, const GV
 		g_strlcpy(statusbar->memory, g_value_get_string (value), 64);
 		text = g_strdup_printf (_("Memory: %s"), statusbar->memory);
 		gtk_label_set_text (GTK_LABEL (statusbar->label_memory), text);
+#ifdef HAVE_GTK3
+		gdk_rgba_parse (&color, "#ab1852");
+		gtk_widget_override_color (statusbar->label_cpu, GTK_STATE_NORMAL, &color);
+#else
 		gdk_color_parse ("#ab1852", &color);
 		gtk_widget_modify_fg (statusbar->label_memory, GTK_STATE_NORMAL, &color);
+#endif
 		g_free (text);
 		break;
 
diff --git a/src/process-window.c b/src/process-window.c
index 8032cdc..a9d1ba2 100644
--- a/src/process-window.c
+++ b/src/process-window.c
@@ -172,9 +172,20 @@ xtm_process_window_init (XtmProcessWindow *window)
 
 	if (geteuid () == 0)
 	{
-		gtk_rc_parse_string ("style\"root-warning-style\"{bg[NORMAL]=\"#b4254b\"\nfg[NORMAL]=\"#fefefe\"}\n"
+#ifdef HAVE_GTK3
+		GtkCssProvider *css_provider;
+		css_provider = gtk_css_provider_new ();
+		gtk_css_provider_load_from_data (css_provider,
+										"#root-warning { background-color: #e53935; color: #ffffff; }",
+										-1, NULL);
+		gtk_style_context_add_provider_for_screen (gdk_screen_get_default (), GTK_STYLE_PROVIDER (css_provider),
+                                               GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+		g_object_unref (css_provider);
+#else
+		gtk_rc_parse_string ("style\"root-warning-style\"{bg[NORMAL]=\"#e53935\"\nfg[NORMAL]=\"#ffffff\"}\n"
 				"widget\"GtkWindow.*.root-warning\"style\"root-warning-style\"\n"
 				"widget\"GtkWindow.*.root-warning.GtkLabel\"style\"root-warning-style\"");
+#endif
 		gtk_widget_set_name (GTK_WIDGET (gtk_builder_get_object (window->builder, "root-warning-ebox")), "root-warning");
 		gtk_widget_show_all (GTK_WIDGET (gtk_builder_get_object (window->builder, "root-warning-box")));
 	}