Clear text before/after ?.

Hello,

Total HTML newbie here. I am trying to create 2 cell phones onscreen having a conversation. I've got the text the way I need it to be. But it puts ALL of the text on the screen and retypes it. I can't figure out how to start with blank screens. I would also like to clear the conversation after https://creditcardsupportx.com https://creditcardsupportx.com/barnes-and-noble-barclay-mastercard https://creditcardsupportx.com/pep-boys-credit-card about a 30s delay so I can place a graphic on top of the screen area of the phones. Any help would be appreciated.

thanks jackyjoy