Way to Set Submit Button Border in WpForms
https://wordpress.org/plugins/styler-...
Download and activate the above wordpress plugin to modify the overall design and layout of your WpForms. It uses customizer because of which you get true WYSIWYG . Styler for WpForms consists more than hundred settings to alter the theme without any CSS . It adds the functionality to change font family, background colors etc from the built in controls.