There is a main window at the front of the chapel. Other tall windows continue along one side of the chapel and cultural hall. These contain symbols like doves and chalices.
I've found a picture of the stained glass where it's more brightly lit here, although it has a watermark unless you buy it. This window was actually based off of William Holman Hunt's painting, The Light of the World, and you can see the resemblance.
I'm so happy that this building continues to be used regularly, and that it has been preserved.