Method to Set submit button Hover background color in WpForms
https://wordpress.org/plugins/styler-...
Download and activate the above free plugin to change the overall design and layout of WpForms. It utilizes WordPress customizer because of which you get true WYSIWYG . Styler for WpForms consists almost 100 settings to alter the theme without any CSS . One can alter margin, border width etc using the built in options.