Hello,
On our demos, we use Mailchimp plugin in the Newsletter form – https://www.mc4wp.com/#utm_source=wp-plugin&utm_medium=mailchimp-for-wp&utm_campaign=plugins-page For example – https://prnt.sc/jndU4W69wa7d https://prnt.sc/nmrsJu7-29u7 https://xstore.helpscoutdocs.com/article/91-mail-chimp-form-custom-styles If you want to use Contact form 7 there, it would be better to contact the support of the plugin first – https://wordpress.org/support/plugin/contact-form-7/
Regards
