I want to make a popup like this. The image will pop up when the user click on its above button.

Actually, i don’t really know what it is called so that i can’t find links to help me to do this.
So any links or help would be very much appreciated.
Thanks.
See my simple demo. It’s just written from scratch.
All you need is a button (visible) and the “popup” (hidden). Now, you add an event listener to check if button is clicked and fade in/out the “popup”.