I recently worked on a Wordpress site that utilized the popular ContactForm7 (https://contactform7.com/) plug-in that only sends an email and does not save data. The client wanted the data saved to a custom CRM database. This is my solution.
Learn how to create flexible layouts using relative units in CSS. New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).