Learn how to create a Modal Box with CSS and JavaScript.
Read on how to do it in this link: https://www.w3schools.com/howto/howto_css_modals.asp
How To Create a Modal Box
A modal is a dialog box/popup window that is displayed on top of the current page:
Try it yourself here: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_modal