It would be very nice if the "Thank you, the webinar is now closed" didn't block the whole window in a "do or die fashion".
I haven't finished reading the questions by the time the organiser has closed the webinar and this popup a) didn't let me scroll up and see the conversation I missed and b) closed the whole webinar by reloading the page once I closed the popup. Leave the information readable after webinar completion, please!