For an introduction the GUI system, see :ref:`gui_concepts`.
This example shows how to pop up a quick message box for the user to click 'Ok' on using the :class:`arcade.gui.OKMessagebox` class.
.. literalinclude:: ../../arcade/examples/gui_ok_messagebox.py
:caption: gui_ok_messagebox.py
:linenos:
:emphasize-lines: 37-47
