Modal Box for Elementor free version is a new component that will allow you to display different content in a popup window.
The Modal Box is fully responsive and can be triggered by a button, image or automatiquely after the page is loaded
Follow this link to consult the documentation.
As you can see in the footer two buttons, who trigger each a modal box with a form, have been inserted within the theme’s widgets.
These two buttons were created in two Elementor section templates triggered by a shortcode that follows this rule.