diff -r 54f5d7eb1335 -r 870dd3d41d83 ui/gtk/toolkit.c
--- a/ui/gtk/toolkit.c	Tue Oct 22 21:17:01 2024 +0200
+++ b/ui/gtk/toolkit.c	Wed Oct 23 14:52:18 2024 +0200
@@ -166,8 +166,11 @@
 }
 
 void ui_close(UiObject *obj) {
-    // TODO
-    //gtk_widget_destroy(obj->widget);
+#if GTK_CHECK_VERSION(4, 0, 0)
+    gtk_window_close(GTK_WINDOW(obj->widget));
+#else
+    gtk_widget_destroy(obj->widget);
+#endif
 }
 
 
@@ -345,6 +348,9 @@
 ".pathbar-button-inactive {\n"
 "  color: alpha(currentColor, 0.5);"
 "}\n"
+".ui_test {\n"
+"  background-color: red;\n"
+"}\n"
 ;
 
 #elif GTK_MAJOR_VERSION == 3