How to make a pop-up window when you press the button?

Hello. I have a button . Please help to make so that when clicked it appeared a window with the text Hello.
March 19th 20 at 08:35
1 answer
March 19th 20 at 08:37

But now you will begin - and how to make prettier, etc.

In General, if anything, Google: sweetalert
Thank you very much. - jevon commented on March 19th 20 at 08:40

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