HTML, CSS & Javascript Responsive Form including REGX validation.
I am using HTML5, CSS3, and javascript to build a form with simple validation.

1. HTML

2.CSS

4. Javascript

You can download full code from my GitHub repo
https://github.com/pushpa-dc/html_form_with_validation
Codepen Link :
https://codepen.io/pushpa_dc/pen/qBOOZXy