Learn how to create an email sign up form popup modal with validation using HTML, CSS, and Javascript in this tutorial. We will add javascript to the button, so whenever you click on it the popup modal will display.

In addition, the form inputs will turn green or red and display a success or error message depending on whether you filled out the form correctly or not. Lastly, the entire website is mobile responsive, so the form shrinks as you resize your screen.

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