Hello,
Please try this code:
.footer .wpcf7-validates-as-email, .footer .wpcf7-submit {
height: 40px !important;
}
.footer .wpcf7 input[type="submit"] {
background-color: #dfa17c !important;
border: 1px solid #dfa17c;
}
http://prntscr.com/jbz5bc
Also, you can use MailChimp form – https://xstore.helpscoutdocs.com/article/66-mailchimp-form-custom-styles
Regards