title: make a div work as a popup
body: <p>I am designing a simple webpage. I want to display a popup window in the same page just like the image attached below.<img src="https://i.stack.imgur.com/AM5tc.png" alt="enter image description here"></p>
  
  <p>I have no idea how to do this. If anyone can give me some code, it'll be great. Thanks in advance. </p>