Fixed sizing of instructions and done page in message_popup to match that of the question's page
Fixed sizing of instructions and done page in message_popup to match that of the question's page

kesiena115/threeflows,mit-teaching-systems-lab/threeflows,mit-teaching-systems-lab/threeflows,mit-teaching-systems-lab/threeflows,mit-teaching-systems-lab/threeflows,kesiena115/threeflows,kesiena115/threeflows