diff --git a/src/highlighting.c b/src/highlighting.c
index b87c18bb..bf4ef1ea 100644
--- a/src/highlighting.c
+++ b/src/highlighting.c
@@ -1339,6 +1339,9 @@ static void show_color_scheme_dialog(void)
 		GEANY_DEFAULT_DIALOG_HEIGHT * 7/4, GEANY_DEFAULT_DIALOG_HEIGHT);
 
 	swin = gtk_scrolled_window_new(NULL, NULL);
+	gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(swin), GTK_SHADOW_ETCHED_IN);
+	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(swin),
+		GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
 	gtk_container_add(GTK_CONTAINER(swin), tree);
 	gtk_container_add(GTK_CONTAINER(vbox), swin);
 	g_signal_connect(dialog, "response", G_CALLBACK(gtk_widget_hide), NULL);